A kiddy gift shop sells bracelets at $4 each, keychains at $5 each, and coloring books at $3 each. Paula and Olive want to buy presents for their friends. Paula buys two bracelets and a keychain, while Olive buys a coloring book and a bracelet.  How much do Paula and Olive spend in total?
Two bracelets cost 2 x $4 = $<T>multiply(2, 4)=8
Thus, Paula spends $8 + $5 = $<T>add(8, 5)=13
Olive spends $3 + $4 = $<T>add(3, 4)=7
Therefore, Paula and Olive spend $13 + $7 = $<T>add(13, 7)=20 in all.
