PSLE The airmail rates to two countries are shown. Nicole sent a letter weighing 93g to Laos and a letter weighing 38g to India by airmail. How much did she pay altogether?
Mass |
Laos |
India |
First 40g |
$0.95 |
$1.30 |
Every additional 20g |
$0.75 |
$0.45 |
Mass of the letter to Laos excluding the first 40 g
= 93 - 40
= 53 g
Sets of additional 20 g of the letter to Laos
= 53 ÷ 20
= 2 r 13
Sets of additional 20 g and part thereof the letter to Laos
= 2 + 1
= 3
Amount that Nicole paid for the letter to Laos
= 0.95 + 3 x 0.75
= 0.95 + 2.25
= $3.20
Amount that Nicole paid altogether
= 3.20 + 1.30
= $4.50
Answer(s): $4.50