PSLE The airmail rates to two countries are shown. Kylie sent a letter weighing 80g to Laos and a letter weighing 46g to New Zealand by airmail. How much did she pay altogether?
Mass |
Laos |
New Zealand |
First 50g |
$0.65 |
$1.10 |
Every additional 25g |
$0.35 |
$0.35 |
Mass of the letter to Laos excluding the first 50 g
= 80 - 50
= 30 g
Sets of additional 25 g of the letter to Laos
= 30 ÷ 25
= 1 r 5
Sets of additional 25 g and part thereof the letter to Laos
= 1 + 1
= 2
Amount that Kylie paid for the letter to Laos
= 0.65 + 2 x 0.35
= 0.65 + 0.70
= $1.35
Amount that Kylie paid altogether
= 1.35 + 1.10
= $2.45
Answer(s): $2.45