PSLE The airmail rates to two countries are shown. Esther sent a letter weighing 108g to Vietnam and a letter weighing 47g to Switzerland by airmail. How much did she pay altogether?
Mass |
Vietnam |
Switzerland |
First 50g |
$0.95 |
$1.20 |
Every additional 25g |
$0.65 |
$0.40 |
Mass of the letter to Vietnam excluding the first 50 g
= 108 - 50
= 58 g
Sets of additional 25 g of the letter to Vietnam
= 58 ÷ 25
= 2 r 8
Sets of additional 25 g and part thereof the letter to Vietnam
= 2 + 1
= 3
Amount that Esther paid for the letter to Vietnam
= 0.95 + 3 x 0.65
= 0.95 + 1.95
= $2.90
Amount that Esther paid altogether
= 2.90 + 1.20
= $4.10
Answer(s): $4.10