PSLE The airmail rates to two countries are shown. Elyse sent a letter weighing 76g to Laos and a letter weighing 23g to New Zealand by airmail. How much did she pay altogether?
Mass |
Laos |
New Zealand |
First 30g |
$0.75 |
$1.90 |
Every additional 15g |
$0.55 |
$0.65 |
Mass of the letter to Laos excluding the first 30 g
= 76 - 30
= 46 g
Sets of additional 15 g of the letter to Laos
= 46 ÷ 15
= 3 r 1
Sets of additional 15 g and part thereof the letter to Laos
= 3 + 1
= 4
Amount that Elyse paid for the letter to Laos
= 0.75 + 4 x 0.55
= 0.75 + 2.20
= $2.95
Amount that Elyse paid altogether
= 2.95 + 1.90
= $4.85
Answer(s): $4.85