Answer:
rate of compound interest: 10%
the sum: Rs. 16000.83
Step-by-step explanation:
compound interest: A = P (1 + r)ⁿ P: initial sum r: annual interest n: period
23425.60 = P (1 + r)⁴ (a)
19361 = P (1 + r)² (b)
A/b: 23425.60 / 19361 = (1 + r)²
(1 + r)² = 1.21
1 + r = 1.1
r = 0.1 (10%)
P = 19361 / 1,21 = 16000.83
