PSLE The airmail rates to two countries are shown. Xylia sent a letter weighing 103g to Vietnam and a letter weighing 47g to New Zealand by airmail. How much did she pay altogether?
Mass |
Vietnam |
New Zealand |
First 50g |
$0.75 |
$1.70 |
Every additional 25g |
$0.45 |
$0.65 |
Mass of the letter to Vietnam excluding the first 50 g
= 103 - 50
= 53 g
Sets of additional 25 g of the letter to Vietnam
= 53 ÷ 25
= 2 r 3
Sets of additional 25 g and part thereof the letter to Vietnam
= 2 + 1
= 3
Amount that Xylia paid for the letter to Vietnam
= 0.75 + 3 x 0.45
= 0.75 + 1.35
= $2.10
Amount that Xylia paid altogether
= 2.10 + 1.70
= $3.80
Answer(s): $3.80