672 dollars is the net price because 15 percent off of 10 percent of 662 dollars is about 10 dollars and 10 + 662 is 672
I would do 12 x 10 = 120
to compensate do 120 - 12 =108 same as 12*9 = 108
The estimate is decent, because we are only $12.00 from the real answer.
Area of triangle = 24cm
Area of rectangle = 120
therefore, w x 12 = 120
w = 10
