PSLE The airmail rates to two countries are shown. Gwen sent a letter weighing 90g to Vietnam and a letter weighing 40g to France by airmail. How much did she pay altogether?
Mass |
Vietnam |
France |
First 50g |
$0.75 |
$1.10 |
Every additional 25g |
$0.45 |
$0.35 |
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 Gwen paid for the letter to Vietnam
= 0.75 + 2 x 0.45
= 0.75 + 0.90
= $1.65
Amount that Gwen paid altogether
= 1.65 + 1.10
= $2.75
Answer(s): $2.75