Question

Ryan finds a video game and a movie DVD that he wants to buy.ItemPrice with taxVideo game$33.85$16.29DVDHe wants to know how much it will cost to buy both items. Since $33.85 is about $34 and $16.29 is about $16, headded $34 and $16 mentally and got $50. How should Ryan compensate to get the exact sum?

Answer 1

The total cost will be given by:

$\begin{gathered} T=Cd+Cv \\ where\colon \\ Cd=33.85 \\ Cv=16.29 \\ T=33.85+16.29 \\ T=50.14 \end{gathered}$

Which is basically subtract 15 cents and then add 29 cents