PSLE The airmail rates to two countries are shown. Emily sent a letter weighing 94g to Laos and a letter weighing 34g to Canada by airmail. How much did she pay altogether?
Mass |
Laos |
Canada |
First 40g |
$0.55 |
$1.50 |
Every additional 20g |
$0.35 |
$0.65 |
Mass of the letter to Laos excluding the first 40 g
= 94 - 40
= 54 g
Sets of additional 20 g of the letter to Laos
= 54 ÷ 20
= 2 r 14
Sets of additional 20 g and part thereof the letter to Laos
= 2 + 1
= 3
Amount that Emily paid for the letter to Laos
= 0.55 + 3 x 0.35
= 0.55 + 1.05
= $1.60
Amount that Emily paid altogether
= 1.60 + 1.50
= $3.10
Answer(s): $3.10