PSLE The airmail rates to two countries are shown. Diana sent a letter weighing 101g to Vietnam and a letter weighing 48g to Australia by airmail. How much did she pay altogether?
Mass |
Vietnam |
Australia |
First 50g |
$0.85 |
$1.60 |
Every additional 25g |
$0.45 |
$0.60 |
Mass of the letter to Vietnam excluding the first 50 g
= 101 - 50
= 51 g
Sets of additional 25 g of the letter to Vietnam
= 51 ÷ 25
= 2 r 1
Sets of additional 25 g and part thereof the letter to Vietnam
= 2 + 1
= 3
Amount that Diana paid for the letter to Vietnam
= 0.85 + 3 x 0.45
= 0.85 + 1.35
= $2.20
Amount that Diana paid altogether
= 2.20 + 1.60
= $3.80
Answer(s): $3.80