Solve a word problem involving simple interest
Question
David borrowed $30,000 to start a business. Four years later, he repaid the $30,000 along with an interest of $1,260. What
was the annual interest rate? Round to two decimal places.

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.