The answer is 26.19. It’s 100% right.
Money with Nathan in his savings account = $40
Rate of interest per annum = 5%
We know that :

In this case :
Principal = $40
Rate = 5%
Time = 1 year
Simple interest he will earn in 1 year :



Amount = Principal + Interest
Amount Nathan has to pay at the end of one year :


Thus, at the end of 1 year Nathan has to pay $42.
Therefore, simple interest Nathan will earn in 1 year = $2
The answer is b all you have to do is imput a value
3, 6 ,9, 23.46,69,138. and 207