PSLE The airmail rates to two countries are shown. Risa sent a letter weighing 63g to Laos and a letter weighing 29g to New Zealand by airmail. How much did she pay altogether?
Mass |
Laos |
New Zealand |
First 30g |
$0.55 |
$1.60 |
Every additional 15g |
$0.25 |
$0.70 |
Mass of the letter to Laos excluding the first 30 g
= 63 - 30
= 33 g
Sets of additional 15 g of the letter to Laos
= 33 ÷ 15
= 2 r 3
Sets of additional 15 g and part thereof the letter to Laos
= 2 + 1
= 3
Amount that Risa paid for the letter to Laos
= 0.55 + 3 x 0.25
= 0.55 + 0.75
= $1.30
Amount that Risa paid altogether
= 1.30 + 1.60
= $2.90
Answer(s): $2.90