PSLE The airmail rates to two countries are shown. Pamela sent a letter weighing 98g to Vietnam and a letter weighing 44g to Switzerland by airmail. How much did she pay altogether?
Mass |
Vietnam |
Switzerland |
First 50g |
$0.75 |
$1.20 |
Every additional 25g |
$0.45 |
$0.30 |
Mass of the letter to Vietnam excluding the first 50 g
= 98 - 50
= 48 g
Sets of additional 25 g of the letter to Vietnam
= 48 ÷ 25
= 1 r 23
Sets of additional 25 g and part thereof the letter to Vietnam
= 1 + 1
= 2
Amount that Pamela paid for the letter to Vietnam
= 0.75 + 2 x 0.45
= 0.75 + 0.90
= $1.65
Amount that Pamela paid altogether
= 1.65 + 1.20
= $2.85
Answer(s): $2.85