Soobin lent Rs 20,000 to one of his friends. On the first 10000 rupees, he charged an interest of 10% per annum and on the remaining amount of 20% per annum. In two years, how much interest does Soobin get?

Given, Principal amount P = Rs 20000

For first Rs. 10000

Time period T = 2 years

Rate of interest R = 10% p.a.

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

SI = $\frac{10000 \times 2 \times 10 }{100}$

SI = Rs 2000

Rest of the amount lent = Rs 20000 − Rs 10000 

                                           = Rs 10000

Rate of interest = 20 % p.a.

Time period = 2 years

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

SI = $\frac{10000 \times 2 \times 20 }{100}$

SI = Rs 4000

Total interest earned = Rs 2000 + Rs 4000 

                                      = Rs 6000

Hence, the correct answer is Rs 6000.