Explanation

We know that the sum of the interior angles of a polygon of n sides \(=(n-2) \times 180^{\circ}=3 \times 180^{\circ}=540^{\circ}\). Hence, the sum of interior angles of a pentagon is 540°.

A house and a lot cost \(\$120,000\). If the house cost three times as much as the lot, how much did the house cost?

Joe earns \( \$13.50\) an hour when he works on weekdays and time-and-a-half per hour when he works on the weekend. Last week, he worked 40 hours Monday through Friday and 6 hours on Saturday. How much did he earn for the week?