200 rupees were lent by Jenny to her friend Raj at a rate of 5% per annum. Six months later, Raj returned the amount with interest. The total amount paid by Raj is ______.

Given, 

Principal amount P = Rs 200

Time period T = 6 months = $\frac{1}{2}$ year

Rate of interest R = 5% p.a.

We know that, 

Simple interest = $\frac{\mathrm{P} \times \mathrm{T} \times \mathrm{R} }{100}$

SI = $\frac{200 \times {\displaystyle \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.} \times 5 }{100}$

SI = Rs 5

Total amount paid by Raj to Jenny after $\frac{1}{2}$ year is,

= Principal amount + Interest

= Rs 200 + Rs 5 

= Rs 205