If a sum of money deposited in a bank at simple interest

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If a sum of money deposited in a bank at simple interest is doubled in 6 years, then after 12 years, the amount will be

1. 5/2 times the original amount
2. 3 times the original amount
3. 7/2 times the original amount
4. 4 times the original amount

Case I,
Let Principal = Rs. p
Simple Interest = Rs. p
Time = 6 years

∴ Rate =	SI × 100
	Principal × Time

Rate =	p × 100
	p × 6

Rate =	50	% per annum
	3

Case II,

Simple Interest =	p × 12 × 50	= Rs. 2p
	100 × 3

Amount = Principal + SI = p + 2p = 3p
i.e., Amount is thrice the principal.