Aiden invests money in an account paying simple interest. He invests $40 and no money is added or removed from the investment. After one year, he has $42.80. What is the simple percent interest per year?

7%

This answer is better when your answering as a percentage.

it's

c. 27 units.

step-by-step explanation:

we are told that in circle a, ∠bae ≅ ∠dae.

we can see from our given diagram that in and ;

, as these are radii of our given circle.

therefore, by sas congruence postulate.

hence, side be will be equal to side de as corresponding parts of congruent triangles are congruent. so we can set an equation to find the value of x as:

now let us substitute x=17 in the expression for the length of be.

therefore, length of be will be 27 units and option c is the correct choice.