Question

Ramesh lent rs.2500 to his two friends.He gave rs.10000 at 10% p.a. simple interest to one of his friends the remaining to other at 12 % p.a.How much interest did he receive in after two years?

Answer 1

I think total money is ₹25000

So here is ur ans
Case - 1
P=10000
R=10%
T=2yr
Interest from 1st friend= P X R X T/100

=10000X 10 X 2 /100=₹2000

CASE - 2
P=15000 (Remaining money)
R=12%
T=2
Interest from 2nd friend= 15000x 12 x2/100=₹3600

Total interest he will get =3600+ 2000=₹5600

Answer 2

SI=PRT/100
10000*10*2/100
2000
A=10000+2000=12000
Ramain=2500-10000
-7500
SI=-7500*10*2/100
-1500
A=-7500+(-1500)
-7500-1500
-9000
TotalSI=2000+(-1500)
=500
R=SI*100/P*T

$\frac{500 \times 100}{2500 \times 2} \\ r = 10\%$
Thank you