PSLE The airmail rates to two countries are shown. Joelle sent a letter weighing 51g to Vietnam and a letter weighing 13g to France by airmail. How much did she pay altogether?
Mass |
Vietnam |
France |
First 20g |
$0.95 |
$1.70 |
Every additional 10g |
$0.75 |
$0.65 |
Mass of the letter to Vietnam excluding the first 20 g
= 51 - 20
= 31 g
Sets of additional 10 g of the letter to Vietnam
= 31 ÷ 10
= 3 r 1
Sets of additional 10 g and part thereof the letter to Vietnam
= 3 + 1
= 4
Amount that Joelle paid for the letter to Vietnam
= 0.95 + 4 x 0.75
= 0.95 + 3.00
= $3.95
Amount that Joelle paid altogether
= 3.95 + 1.70
= $5.65
Answer(s): $5.65