Question

at what rate of simple interest in 4years a sum of money will became foru times the principal​

Answer 1

Step-by-step explanation:

let Principle be x

then amt.=4x

SI=3x

AtoQ.

PTR/100=SI

x×4×R/100=3x

=xR/25=3x

xR/x=3×25

R=75%

Answer 2

Answer:

75%

Step-by-step explanation:

let the principal be 100

so four times of the principal = 400

so money needs to become 400 in 4 years

so simple interest= 400-100= 300

SI=PRT/100

R=SI*100/PT

rate of interest = 300*100/100*4

                          =75%