How Many Years To Make Money Back?

If the distance of earth form the sun were half the present value, how many days will make one year?

muni got Some amount of money from her father.in how many years the ratio of money and the interest obtained from it will be 10:3 at 6% per annum?

How many light years make 1 par sec ?

in how many years a sum of money trebles at 5% pa.compound interest payable on half yearly basis?

In how many years will a sum of money trebles itself at 25% per annum?

In how many years will a sum of money become sixteen times itself at 30% p.a. simple interest?