PSLE The airmail rates to two countries are shown. Hilda sent a letter weighing 90g to Malaysia and a letter weighing 38g to New Zealand by airmail. How much did she pay altogether?
Mass |
Malaysia |
New Zealand |
First 40g |
$0.75 |
$1.10 |
Every additional 20g |
$0.45 |
$0.35 |
Mass of the letter to Malaysia excluding the first 40 g
= 90 - 40
= 50 g
Sets of additional 20 g of the letter to Malaysia
= 50 ÷ 20
= 2 r 10
Sets of additional 20 g and part thereof the letter to Malaysia
= 2 + 1
= 3
Amount that Hilda paid for the letter to Malaysia
= 0.75 + 3 x 0.45
= 0.75 + 1.35
= $2.10
Amount that Hilda paid altogether
= 2.10 + 1.10
= $3.20
Answer(s): $3.20