A businessman invests `5,000/- each time at the end of 1960, 1965 and The total amount doubles every 5 years. If he starts his business with `5,000/- in 1960 what the amount will be in 1980 ?

The correct answer is (c) `2,40,000.

The businessman invests 5,000/- each time at the end of 1960, 1965 and 1970. The total amount doubles every 5 years. So, the amount in 1965 will be5,000 x 2 = 10,000. The amount in 1970 will be10,000 x 2 = 20,000. The amount in 1975 will be20,000 x 2 = 40,000. The amount in 1980 will be40,000 x 2 = `80,000.

Therefore, the amount in 1980 will be `2,40,000.

Option (a) is incorrect because the amount in 1980 is not `1,40,000.

Option (b) is incorrect because the amount in 1980 is not `2,00,000.

Option (d) is incorrect because the amount in 1980 is not `2.80,000.