PSLE The airmail rates to two countries are shown. Jane sent a letter weighing 84g to Vietnam and a letter weighing 24g to Australia by airmail. How much did she pay altogether?
Mass |
Vietnam |
Australia |
First 30g |
$0.95 |
$1.80 |
Every additional 15g |
$0.75 |
$0.80 |
Mass of the letter to Vietnam excluding the first 30 g
= 84 - 30
= 54 g
Sets of additional 15 g of the letter to Vietnam
= 54 ÷ 15
= 3 r 9
Sets of additional 15 g and part thereof the letter to Vietnam
= 3 + 1
= 4
Amount that Jane paid for the letter to Vietnam
= 0.95 + 4 x 0.75
= 0.95 + 3.00
= $3.95
Amount that Jane paid altogether
= 3.95 + 1.80
= $5.75
Answer(s): $5.75