PSLE The airmail rates to two countries are shown. Hazel sent a letter weighing 78g to Vietnam and a letter weighing 10g to France by airmail. How much did she pay altogether?
Mass |
Vietnam |
France |
First 20g |
$0.95 |
$1.50 |
Every additional 10g |
$0.55 |
$0.45 |
Mass of the letter to Vietnam excluding the first 20 g
= 78 - 20
= 58 g
Sets of additional 10 g of the letter to Vietnam
= 58 ÷ 10
= 5 r 8
Sets of additional 10 g and part thereof the letter to Vietnam
= 5 + 1
= 6
Amount that Hazel paid for the letter to Vietnam
= 0.95 + 6 x 0.55
= 0.95 + 3.30
= $4.25
Amount that Hazel paid altogether
= 4.25 + 1.50
= $5.75
Answer(s): $5.75