Direction : What value should come in the place of question mark (?) in the following questions?

9.5 % of 720 + 1.5 % of 320 = ? 

If the compound interest on a certain sum for two consecutive years is Rs.220 and Rs.242, then the rate of interest per annum is 

The cost of levelling a ground in rectangular shape for a proposed garden at 80 paise per square meter is Rs.132 and the cost of fencing the same along its perimeter is Rs.78 at Rs.1.50 per meter. If the garden is extended in rectangular shape with its sides as cubes of the originally proposed garden, what will be the perimeter of the garden after extension?

What is the value of $${0.74×1.23×0.13\over (0.37)^{3}+(0.41)^{3}-8(0.39)^{3}}$$ ?

If a+b=2c, find $${a\over a-c}+{c\over b-c}?$$

How much time will it take for an amount of Rs.360 to yield Rs.72 as interest at 5 % p.a of simple interest?

Simple interest on an amount is Rs. 24 and true discount on the same is Rs. 20. The principal amount is

A number if required by 25% becomes 225. By what percent should be increased so that it becomes 375?