1.  In 2000, a part of ₹ 30 lakhs was invested in Company P and the rest was invested in Company Q for one year. The total interest received was ₹ 2.43 lakhs. What was the amount invested in Company P?

A. ₹ 9 lakhs
B. ₹ 11 lakhs
C. ₹ 12 lakhs
D. ₹ 18 lakhs

Answer: Option D

Explanation:

Let ₹ x lakhs be invested in Company P in 2000, the amount invested in Company Q in 2000 = ₹ (30 - x) lakhs.

Total interest received from the two Companies after 1 year

    = ₹ [(7.5% of x) + {9% of (30 - x)}] lakhs

    = ₹ [ 2.7 - ( 1.5x ) ] lakhs.
100

Therefore [ 2.7 - ( 1.5x ) ] = 2.43     =>     x = 18.
100