Question

5. Find the rate per cent per annum when:
(i) principal = Rs 400, S. I. = Rs 60, time = 4 years
(ii) principal = Rs 300, S. I. = Rs 15, time = 2.5 years
(iii) principal = Rs 2250, S. I. = Rs 450, time = 4 years
(iv) principal = Rs 900, S. I. = Rs 900, time = 8 yyear

Answer 1

Step-by-step explanation:

(i) S.I. = P×R×T /100

60 = 400×R×4/100

60×100/1600 = R

6000/1600 = R

3.75 = R

(ii) S.I. = P×R×T/100

15 = 300×R×2.5/100

15×100/300×2.5 = R

1500/750 = R

2 = R

(iii) S.I. = P×R×T /100

450 = 2250×R ×4/100

450*100/2250×4 = R

45000/9000 = R

5 = R

(iv) S I. = P×R×T/100

900 = 900×R×8/100

900×100/7200 = R

90000/7200 = R

12.5 = R