The cost of school bags and shoes are in the ratio 7 : 5. The cost of a school bag is ₹ 200 more than that of a shoe. So what is the price of the shoes?

What is the difference (in ₹) between the simple interest and the compound interest on a sum of ₹8000 for $$32{2\over 5}$$ years at the rate of 10% p.a., when the interest is compounded yearly?

A is 80% more than B and C is $$48{4\over 7}\%$$ less than the sum of A and B. By what percent is C less than A?

What should come in place of the question mark '?' in the following number series?

64, 62, 65, 60, 67, ?

On selling 17 balls at Rs. 720 there is a loss equal to the cost price of 5 balls. The cost price of a ball is: 

Find the next term in the series.1329, 997, 725, 507, 337, ?

There are two numbers such that the first number is four times of the second mumber. If their average is 65, then what is the second number?

While selling a cooler, a shopkeeper gives a discount of 10% on the marked price. If he gives a discount of 12% he earns ₹ 35 less as profit. The marked price of the cooler is