" Find a number whose "4%" is "72

Find the number of factors 72.

As a result of publicity on smoking, the number of smoker is decreased by 6 1/4% every year in comparison to its previous year. If the number of smokers at present in a city is 33750 find the number of smolers in that city 3 years before.

What is the number, 6 1/4% of which is 2?

Find the number of conversion times the Interest is compounded and rate for each:A sum taken for 2 years at 4% per annum is compounded half yearly.

Find the slope of the line whose inclination is: 72^@, 30^@

Find the number of conversion times the interest is compounded and rate for following A sum taken for 1 1/2 years at 4% per annum is compounded half yearly.

Find the value of : 4% of 12.5

Find the following: 8 is 4% of which number? 6 is 60% of which number?