PSLE The airmail rates to two countries are shown. Elyse sent a letter weighing 91g to Malaysia and a letter weighing 33g to New Zealand by airmail. How much did she pay altogether?
Mass |
Malaysia |
New Zealand |
First 40g |
$0.55 |
$1.50 |
Every additional 20g |
$0.25 |
$0.45 |
Mass of the letter to Malaysia excluding the first 40 g
= 91 - 40
= 51 g
Sets of additional 20 g of the letter to Malaysia
= 51 ÷ 20
= 2 r 11
Sets of additional 20 g and part thereof the letter to Malaysia
= 2 + 1
= 3
Amount that Elyse paid for the letter to Malaysia
= 0.55 + 3 x 0.25
= 0.55 + 0.75
= $1.30
Amount that Elyse paid altogether
= 1.30 + 1.50
= $2.80
Answer(s): $2.80