Question

Rose went to a stationary shop.

She purchased $2$ packs of red pens, $4$ packs of black pens, and $3$ packs of blue pens.

The cost of each pack of pens was $\$2.50$.

Find the total amount rose spent on the pens.

Answer 1

Objective: To write the expression for the total amount.

Rose purchased $2$ packs of red pens, $4$ packs of black pens, and $3$ packs of blue pens.

Calculate the total number of the packs of pens as shown:

$2+4+3=9$.

The cost of each pack of pens is $\$2.50$.

Caculate the total amount of the pens as follows:$2.50\times 9=22.5$.

Hence, the total amount is $\mathbf{\$}\mathbf{22}\mathbf{.}\mathbf{5}$.