He needs 1 350 sq ft of hardwood
Step-by-step explanation:
Data:
Kitchen's measurements: 25 ft by 25 ft
Bedroom's measurements: 25 ft by 20 ft
Excess wanting to purchase: 20% => 1.20
Formula:
Area of the kitchen: A(k) = side * side
Area of the bedroom: A(b) = side * side
Total Area: A = A(k) + A(b)
Amount of sq. ft of hardwood neede: T(h) = A + (A * 20%) = A + (A * 20 / 100) = A * 1.20
Solution:
A(k) = 25 * 25 = 625 sq. ft
A(b) = 25 * 20 = 500 sq. ft
A = 625 + 500 = 1 125 sq. ft
T(h) = 1 125 * 1.20 = 1 125 + ( 1 125 * 20 / 100 ) = 1 350 sq. ft