Question

Certain sum of money an amounts to rs 2500 in a span of 5 years and further to rs.3000 in a span of 7 years at simple interest the sum is

Answer 1

Answer:

let sum = P

let rate = R %

P+5PR/100 = 2500

100P+5PR = 250000

20P+PR = 50000 -----------------------(1)

similarly,

P+7PR/100 = 3000

100P + 7PR = 300000 -------------------(2)

solving both equation now ,

[ multiply equation (1) by 7 and subtracting (2) ]

140P + 7PR = 350000

100P +7PR = 300000

------------------------------

40P = 50000

P = 1250 (Ans.)

[ mark as brainlist if you understand ]

Answer 2

simple interest diff of two years is 500.for one year it is 250.

so subtract 5*250=1250 from 2500 for 5 years.

the initial sum is2500-1250=1250

option d