Parking fee for a two wheeler is Rs. 10 per day i.e., for first day, and then after Rs. 2 for everyday. So what will be the amount to be paid for 15 days?

A sample contains two radioactive substances A and B in the ratio of 4 : 1 . If their half lives are 24 and 16 hours respectively , then after two days what will be the ratio of A and B?

Ram gives his son Rs. 100 on one day, Rs. 50 on the second day, Rs. 25 on third day and so on. What will be total amount given by Ram to his son starting from the first day, if he lives forever?

If it rains a dealer in rain coats can earn Rs . 500 Rs a day . If it is fair , he can loose Rs.40/- per day . His mean profit if the probability of a fair day is 0.6 is

A green grocer had a profit of Rs. 250 on Monday a loss of Rs.120 on Tuesday and loss of Rs.180 on Wednesday. Find total profit or loss after 3 days.

Mid day meal rice weighing 45kg. is needed for 20students for 15days what is the weight of rice required for 10 students for 30days.

22 students started for a tour with Rs. 3300/-. Two of them dropped with their share Rs. 500/- from the tour. And then remaining completed their tour. So what amount is to be paid in addition by the remaining?

Rahul's father wants to deposit some amount of money every year on the day of Rahul's birthday. On his 1^(st) birthday Rs.100, on his birthday Rs.300, on his 3^(rd) birthday Rs.600, on his birthday Rs.1000 and so on. What is the amount deposited by his father on Rahul's 15^(th) birthday?

A machine costs Rs. 5,00,000. if the value depreciates 15% in the first year, 13 1/2% in the second year, 12% in the third year and so on. What will be its value at the end of 10 years, when all the percentages will be applied to the original cost?

The cost of 1kg potatoes and 2 kg tomatoes was Rs. 30 on a certain day. After two days, the cost of 2 kg potatoes and 4 kg tomatoes was found to be Rs. 66.Identify the unknowns in each situation. We observe that there are two unknowns in each case.

A lending library has fixed charge for the first three days and an additional charges for each day thereafter. John paid 27 for a book kept for seven days. If the fixed charges be x and subsequent per day charges be y, then write the linear equation representing the above information and draw the graph of the same. From the graph, find fixed charges for the first three if additional charges for each day thereafter is 4. Find additional charges for each day thereafter if the fixed charges for the first three days of 7.