Ashifur September 9, 2023 - 18:42
Problem: Mrs.. Barbara invests Tk. 2,400 in the National Bank at 5%. How much additional money must she invest at 8% so that the total annual income will be equal to 6% of her entire investment?

View all: MODHUMOTI BANK LTD (PO) WRITTEN QUESTION (MATH) SOLVE | 2018

Correct Answer: 1,200 টাকা

Explanation:

Let. Tk. x is the additional money Mrs. Barbara invests at 8% interest

Her total investment = (x$\times$2,400) tk

According to the question.

(2,400 x 5%) + (x$\times$8%) = (2,400 + x) x 6%

=> 120+$\frac{8x}{100}$ = (2,400+x)x$\frac{6}{100}$

=> 120+$\frac{8x}{100}$ = 144+$\frac{6x}{100}$

=> $\frac{8x}{100}$-$\frac{6x}{100}$ = 144-120

=> $\frac{2x}{100}$ =24

=> $\frac{x}{50}$ = 24

so, x=1,200 টাকা

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