Post-UTME Mathematics 2017 Objective — Question 31

Antonio buys 4 notebooks for $3.50 each. The next day he returns to the store and exchanges 3 notebooks that have gone on sale for $1.75 each. Antonio uses the expression (4 x $3.50) - (3 x $1.75) to calculate the money he should receive back. Which of the following expressions could Antonio have also used?

• A. $3.50 - $1.75
• B. 3($3.50 - $1.75) + $3.50Correct
• C. (4 x $3.50) - $1.75
• D. (4 x 3) - ($3.50 x $1.75) / E. 12 - ($3.50 + $1.75)