At a fast food restaurant, a cup of sundae costs \( \$ r \) A chicken burger costs times as much as the sundae. A box of French tries costs \( \$ 3 \) (a) Find the total cost of a sundae and a chicken burget Express your ansx in terms of \( r \) (b) If \( r=2 \) how much do 3 chicken burgers and 2 boxes of French cost? [2 ma

To find the total cost of a sundae and a chicken burger, you first need to determine the price of the chicken burger, which is \( k \times r \) (where \( k \) is the multiplier for the price of the sundae). Adding the cost of the sundae gives you \( r + k \times r = (1 + k) \times r \). If \( r = 2 \), let’s say the chicken burger costs twice as much as the sundae, so \( k = 2 \). Thus, a chicken burger costs \( 2 \times 2 = 4 \). The total cost for 3 chicken burgers is \( 3 \times 4 = 12 \). Additionally, for 2 boxes of French fries at \( 3 \) each, \( 2 \times 3 = 6 \). Therefore, the total cost is \( 12 + 6 = 18 \).