Question

By investing Rs. 5000 a "baniya" gets Rs. 390 as an interest. How much does he invest at 7 % interest if the other
part is invested at 9 % interest?
(a) Rs. 2500
(b) Rs. 3000
(c) Rs. 2000
(d) Rs. 2800​

Answer 1

Answer:

3000

Step-by-step explanation:

Applying the Simple Interest Formula,

(P*R*T)/100= 390

(5000*R*1)/100= 390 (since, time is bot mentioned, we take it as 1 yr)

Therefore, R= 7.8%

by applying the allegation method,

(9-7.8)/(7.8-7.0)

= 3/2

since we need to find the investment of 7%,

(5000*⅗)

= 3000