Answer:
please see detailed answers below
Explanation:
a) there are one hunred squares in total.
there are 10 + 9 = 19 white (unshaded) ones.
so there are 100 -19 = 81 shaded ones.
(81/100) X 100 = 81%.
81% of 72, 200
= (81/100) X 72, 200
= 0.81 X 72, 200
= 58, 482
b) there are 5 equal rectangles. they make up a whole (ie 100%)
the shaded part (1 rectangle) = 100/5 = 20%.