PSLE The airmail rates to two countries are shown. Sarah sent a letter weighing 90g to Malaysia and a letter weighing 44g to New Zealand by airmail. How much did she pay altogether?
Mass |
Malaysia |
New Zealand |
First 50g |
$0.85 |
$1.50 |
Every additional 25g |
$0.45 |
$0.65 |
Mass of the letter to Malaysia excluding the first 50 g
= 90 - 50
= 40 g
Sets of additional 25 g of the letter to Malaysia
= 40 ÷ 25
= 1 r 15
Sets of additional 25 g and part thereof the letter to Malaysia
= 1 + 1
= 2
Amount that Sarah paid for the letter to Malaysia
= 0.85 + 2 x 0.45
= 0.85 + 0.90
= $1.75
Amount that Sarah paid altogether
= 1.75 + 1.50
= $3.25
Answer(s): $3.25