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A plumber can be paid according to the f...

A plumber can be paid according to the following schemes, In the first scheme he will be paid rupees 500 plus rupees 70 per hour, and in the second scheme he will paid 120 rupees per hour. If he works x hours. Then for what value of x does the first scheme give better wages?

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` x lt 8.6`
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Assertion (A) : A plumber will be paid according to following schemes : In first scheme he will be paid ₹500 plus ₹70 her hour and in the second scheme he will paid ₹120 per hour. If he work for less than 10 hours the first scheme give better wages. Reason (R) : In the first scheme he will get a fixed ₹500 whereas longer than 10 hours second scheme will pay more.

Raghu wish to buy a laptop. He can buy it by paying ₹40,000 cash or by giving it in 10 installments as ₹4800 in the first month, ₹4750 in the second month, ₹4700 in the third month and so on. If he pays the money inn this fashion, find total amount paid in 10 installments.