Please can someone help me on how to answer this question?

Use the multiplier method to incrases £258 by 43%

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π