In how many years will Rs 4600 amount to Rs 5428 at 3 % per annum simple interest?

If $$ \sqrt{0.04×0.4×a} =0.4×0.04×{\sqrt{b}}$$ then the value of $$ {a\over b}$$ is:

Find the value of ∠BAC in the given diagram If AB=AC=CD and ∠ADB=20°?

If the present population of a village is 55,566, which was 35000 2 years ago, then find the rate of increase of population per year.

Raghav went to a shopping mall to purchase clothes. He had two coupons with him, but only one can be used on a single day. Using the first coupon, a total discount of 30% could be obtained on the total amount. Using the second coupon, he will get 80% off on the price of the costliest shirt if he buys at least 3 shirts. What is the price at which Raghav can purchase 3 shirts at a minimum price if the prices of the three shirts are Rs.1,250, Rs.1,540 and Rs.1,375?

Ranbir bought a car at a 50% discount on the cost price of the car. Had he got a 60% discount, he would have spent 1,00,000 less. Calculate the cost price of the car?