- 10%
- 20%
- 15%
- None of these

Option 1 : 10%

__Shortcut Trick__

Let the Principal be 100.

P = 100, then A = 200 and SI will be 200 - 100 = 100

SI = 100 for 10 years

Rate = 100/10 = 10%.

∴ The rate of interest is 10%.

**Traditional method:**

Given:

Time period = 10 years

Formula used:

SI = (P × R × T)/100

A = P + SI

Where, P = principal, R = rate, T = time, SI = simple interest

Calculations:

The sum of money is 2P

SI = 2P - P

⇒ P = (P × R × 10)/100

⇒ 1 = R/10

⇒ R = 10%

∴ The rate of interest is 10%.

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