My friend bought a headset on Ebay for $45 and then sold it for 40% more. How much did he sell it for?

63

Step-by-step explanation:

Multiply 0.4 by 45 (which is 18) then add that to 45.

Your friend sold it for $63 dollars

Step-by-step explanation:

40%= 40/100= .4

Multiply 45 by .4

= 18

Add 18 to 45

45+18=63

Your answer is 63

a) justify

step-by-step explanation:

justifying is just part of everyday life. justify kind of means proof so i think the answer is a) justify.

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: