SSC MTS 5 Aug 2019 Shift 2 Paper

Short Trick:
Rate of interest = {(1100 – 1000)/1000} = 10%
Detailed Solution :
Sum after three years = Rs. 1000Sum after four years = Rs. 1100
For compound interest,
A = P (1 + r/100)‌t
⇒ 1000 = P(1 + r/100)‌3 ---- (1)
⇒ 1100 = P (1 + r/100)‌4 ---- (2)
From (2) /(1),
⇒ 11/10 = (1 + r/100)
⇒ 11/10 – 1= r/100
⇒ r/100 = 1/10
⇒ r = 100/10 = 10%
∴ Rate of interest is 10%.