PSLE The airmail rates to two countries are shown. Emma sent a letter weighing 80g to Vietnam and a letter weighing 25g to Sweden by airmail. How much did she pay altogether?
Mass |
Vietnam |
Sweden |
First 30g |
$0.95 |
$1.40 |
Every additional 15g |
$0.65 |
$0.60 |
Mass of the letter to Vietnam excluding the first 30 g
= 80 - 30
= 50 g
Sets of additional 15 g of the letter to Vietnam
= 50 ÷ 15
= 3 r 5
Sets of additional 15 g and part thereof the letter to Vietnam
= 3 + 1
= 4
Amount that Emma paid for the letter to Vietnam
= 0.95 + 4 x 0.65
= 0.95 + 2.60
= $3.55
Amount that Emma paid altogether
= 3.55 + 1.40
= $4.95
Answer(s): $4.95