PSLE The airmail rates to two countries are shown. Marion sent a letter weighing 90g to Vietnam and a letter weighing 43g to New Zealand by airmail. How much did she pay altogether?
Mass |
Vietnam |
New Zealand |
First 50g |
$0.85 |
$1.60 |
Every additional 25g |
$0.55 |
$0.50 |
Mass of the letter to Vietnam excluding the first 50 g
= 90 - 50
= 40 g
Sets of additional 25 g of the letter to Vietnam
= 40 ÷ 25
= 1 r 15
Sets of additional 25 g and part thereof the letter to Vietnam
= 1 + 1
= 2
Amount that Marion paid for the letter to Vietnam
= 0.85 + 2 x 0.55
= 0.85 + 1.10
= $1.95
Amount that Marion paid altogether
= 1.95 + 1.60
= $3.55
Answer(s): $3.55