exam Maths Puzzle Numerical Ability

Simplify. (Multiply)

( -5 {{{ (sqrt x + sqrt y) }}} )({{{ sqrt (x-4) sqrt (y)}}} )

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To Whomever can assist, thank you!

If a box of candy costs a retailer $2.50, and he wants to make a profit of 50% based on the selling price, what price should he charge for the candy?
I dont get how to do n+(-5).