PSLE The airmail rates to two countries are shown. Jean sent a letter weighing 64g to Vietnam and a letter weighing 11g to Sweden by airmail. How much did she pay altogether?
Mass |
Vietnam |
Sweden |
First 20g |
$0.85 |
$1.40 |
Every additional 10g |
$0.45 |
$0.60 |
Mass of the letter to Vietnam excluding the first 20 g
= 64 - 20
= 44 g
Sets of additional 10 g of the letter to Vietnam
= 44 ÷ 10
= 4 r 4
Sets of additional 10 g and part thereof the letter to Vietnam
= 4 + 1
= 5
Amount that Jean paid for the letter to Vietnam
= 0.85 + 5 x 0.45
= 0.85 + 2.25
= $3.10
Amount that Jean paid altogether
= 3.10 + 1.40
= $4.50
Answer(s): $4.50