PSLE The airmail rates to two countries are shown. Tammy sent a letter weighing 73g to Laos and a letter weighing 26g to Canada by airmail. How much did she pay altogether?
Mass |
Laos |
Canada |
First 30g |
$0.65 |
$1.50 |
Every additional 15g |
$0.35 |
$0.65 |
Mass of the letter to Laos excluding the first 30 g
= 73 - 30
= 43 g
Sets of additional 15 g of the letter to Laos
= 43 ÷ 15
= 2 r 13
Sets of additional 15 g and part thereof the letter to Laos
= 2 + 1
= 3
Amount that Tammy paid for the letter to Laos
= 0.65 + 3 x 0.35
= 0.65 + 1.05
= $1.70
Amount that Tammy paid altogether
= 1.70 + 1.50
= $3.20
Answer(s): $3.20