Q21 of 32 Page 46

A principal becomes twice of its amount in 20 yrs at a certain rate of simpleinterest. At the same rate of simple interest, that principal becomes thrice of its amount in

Amount = 2p, Principal = p, r = r, t = 20 yr


Interest = Amount – Principal = 2p – p = p


Since,




Amount = 3p, Principal = p


⇒ Interest = 3p – p = 2p


P = p , r = 5 , t = ? and I = 2p


Since,



yr


Hence, (C) is correct option.

More from this chapter

All 32 →
20

Rothinbabu deposits the money for each of his two daughters in such a way that when the ages of each of his daughters will be 18yrs. each one will get ₹1,20,000. The rate of simple interest per annum in the bank is 10% and the present ages of his daughters are 13yrs. and 8 yrs. respectively. Let us determine the money, he had deposited separately inthe bank for each of his daughters.

 21

If the interest of ₹p at the rate of simple interest of r% per annum in t years is I,then

 21

If a principal becomes twice of its amount in 10 yrs, the rate of simple interest per annum is

 21

If the total interest becomes ₹ x for any principal having the rate of simple interest of x% per annum for x years then the principal will be