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Rajesh want to chose a best plan for his mobile phone. He has 2 options available with him. The first plan of company A, cost Rs 20 per month, with costing an additional 25 paise per minute.
The second plan of company B charge Rs 40 per month, but calls cost 8 paise per minute. These two situations are shown below in the form of linar equations.
The total cost of the two company's are given as :
` y =0.25 x + 20`
`and y = 0.8x + 40`
Where, x is the minutes used any y is the total cost per month.

If Rajesh decides to take first plan and calls for 90 minutes in a month, then how much amount he will have to pay ?

A

Rs 45

B

Rs 42.50

C

Rs 40

D

Rs 20

Text Solution

Verified by Experts

The correct Answer is:
B
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Rajesh want to choose a best plan for his mobile phone. He has 2 options available with him. The first plan of company A, cost Rs. 20 per month, with costing an additional 25 paise per minute. The second plan of company B charges Rs. 40 per month, but calls cost 8 paise per minute. These two situations are shown below in the form of linear equations. y = 0.25 x + 20 and y = 0.08 x + 40 Where, x is the minutes used any is the total cost per month Which type of lies is represented by the system of linear equations x + 2y - 4 = 0, 2x + 4y - 12 = 0 ?

For her mobile phones service Divya pays Rs 145 per month and 75 paise for each extra minutes in the monthly plan. She received a bill of Rs 178 last month . How many extra minutes did she use her phone beyond the allowed time.

Knowledge Check

  • Rajesh want to chose a best plan for his mobile phone. He has 2 options available with him. The first plan of company A, cost Rs 20 per month, with costing an additional 25 paise per minute. The second plan of company B charge Rs 40 per month, but calls cost 8 paise per minute. These two situations are shown below in the form of linar equations. The total cost of the two company's are given as : y =0.25 x + 20 and y = 0.8x + 40 Where, x is the minutes used any y is the total cost per month. Rajesh's friend takes second plan and also calls for 90 minutes in a month. Then how much amount will he have to pay ?

    A
    Rs 47
    B
    Rs 112
    C
    Rs 45
    D
    Rs 45. 20

  • Rajesh want to chose a best plan for his mobile phone. He has 2 options available with him. The first plan of company A, cost Rs 20 per month, with costing an additional 25 paise per minute. The second plan of company B charge Rs 40 per month, but calls cost 8 paise per minute. These two situations are shown below in the form of linar equations. The total cost of the two company's are given as : y =0.25 x + 20 and y = 0.8x + 40 Where, x is the minutes used any y is the total cost per month. What are the values of x and y in the system are linear equations x + 2y =-1 and 2x - 3y = 12

    A
    `(-3,-2)`
    B
    `(3,2)`
    C
    `(-3,2)`
    D
    `(3,-2)`

  • Rajesh want to chose a best plan for his mobile phone. He has 2 options available with him. The first plan of company A, cost Rs 20 per month, with costing an additional 25 paise per minute. The second plan of company B charge Rs 40 per month, but calls cost 8 paise per minute. These two situations are shown below in the form of linar equations. The total cost of the two company's are given as : y =0.25 x + 20 and y = 0.8x + 40 Where, x is the minutes used any y is the total cost per month. If the system of pair of linear equation kx - 2y = 5, 3x + y =1 has a unique solution then the value of k is :

    A
    `k = 6`
    B
    `k ne -6`
    C
    `k ne (3)/(2)`
    D
    `k ne (2)/(3)`

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    Rajesh want to chose a best plan for his mobile phone. He has 2 options available with him. The first plan of company A, cost Rs 20 per month, with costing an additional 25 paise per minute. The second plan of company B charge Rs 40 per month, but calls cost 8 paise per minute. These two situations are shown below in the form of linar equations. The total cost of the two company's are given as : y =0.25 x + 20 and y = 0.8x + 40 Where, x is the minutes used any y is the total cost per month. Which type of lines is represented by the system of linear equations x + 2y - 4 =0, 2x + 4y -12 =0 ?

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