Solution
P = principal amount
R = ratio of interest
T = time
A = P + interest
$$A = P+\frac{P\times\ R\times\ T}{100}$$
$$1440 = P+\frac{P\times\ 5\times\ 4}{100}$$
$$1440 = P+\frac{20P}{100}$$
$$1440=P+\frac{P}{5}$$
$$1440=\frac{6P}{5}$$
$$240=\frac{P}{5}$$
P = ₹1200
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