Question

. An amount doubles in 5 years by the simple interest. How many years are
required for the same amount with same rate of interest to get converted to five
times the original amount?
(1) 12-years (2) 20 years (3) 25 years
(4) 10 years​

Answer 1

Answer:

20 yrs

Step-by-step explanation:

let the original amount be p rupee

Here, t1 = 5 yrs

         i1   = p rupees

hence we know,   i1 = prt/100

                        or, r = 100i1/pt = 100×p/p×5 = 20%

t2= 100×i2/pr = 100×(5p-p)/p×20 = 5×4  yrs

                                                      = 20 yrs