SSC CGL Tier II 1 Dec 2016 Paper 1

(1) According to the question,
S.I. for 2 years 6 months = Rs. (5500 – 4000)
⇒ S.I. for $\frac{5}{2}$ years = Rs. 1500
∴ S.I. for 1 year = $\frac{1500\times 2}{5}$ = Rs. 600
∴ S.I. for 2 years = Rs. 1200
∴ Principal = Rs. (4000 – 1200) = Rs. 2800
∴ Rate = $\frac{\mathit{S}.\mathit{I}.\times 100}{\mathrm{Pricipal}\times \mathrm{Time}}$
$=\frac{1200\times 100}{2800\times \mathit{u}2}=\frac{150}{7}$
$=21\frac{3}{7}\%$ per annum.