The width, length, and height of a rectangular prism are each increased by 10%. What is the percent increase in the surface area of the prism? Express your answer to the nearest whole number.
area = 2 ( l*w + w*h + h* l ) now increase the measurments
2 ( 1.1 l * 1.1w + 1.1 w + 1.1h + 1.1h* 1.1 l )
2 ( 1.21) ( l*w + w*h + h*l) <======= a 21% increase