A school canteen sells a sandwich at $2, a hamburger at $2, one stick of hotdog at $1, and a can of fruit juice at $2 each can. Selene buys three sandwiches and a can of fruit juice. Tanya buys two hamburgers and two cans of fruit juice.  How much do Selene and Tanya spend together?
Three sandwiches cost 3 x $2 = $<T>multiply(3, 2)=6
So, Selene spends $6 + $2 = $<T>add(6, 2)=8
Two hamburgers cost 2 x $2 = $<T>multiply(2, 2)=4
Two cans of fruit juice cost 2 x $2 = $<T>multiply(2, 2)=4
Thus, Tanyah spends $4 +$4 = $<T>add(4, 4)=8
Therefore, Selene and Tanya spend $8 + $8 = $<T>add(8, 8)=16
