The simple interest on a loan of $200 at 10 percent interest per year is:

To calculate the simple interest, you can use the formula:

[ text{Simple Interest} = P times r times t ]

where:

– ( P ) is the principal amount (the initial loan),

– ( r ) is the rate of interest (as a decimal),

– ( t ) is the time in years.

In this case:

– ( P = 200 ) (the loan amount),

– ( r = 10% = 0.10 ),

– Assuming ( t = 1 ) year for the annual interest calculation.

Plugging in the values:

[ text{Simple Interest} = 200 times 0.10 times 1 = 20 ]

So, the simple interest on a loan of $200 at 10 percent interest per year is $20 per year until the loan is paid off.

The correct answer is: $20 per year until the loan is paid off.