PSLE The airmail rates to two countries are shown. Jean sent a letter weighing 59g to Vietnam and a letter weighing 16g to Egypt by airmail. How much did she pay altogether?
Mass |
Vietnam |
Egypt |
First 20g |
$0.65 |
$1.10 |
Every additional 10g |
$0.45 |
$0.25 |
Mass of the letter to Vietnam excluding the first 20 g
= 59 - 20
= 39 g
Sets of additional 10 g of the letter to Vietnam
= 39 ÷ 10
= 3 r 9
Sets of additional 10 g and part thereof the letter to Vietnam
= 3 + 1
= 4
Amount that Jean paid for the letter to Vietnam
= 0.65 + 4 x 0.45
= 0.65 + 1.80
= $2.45
Amount that Jean paid altogether
= 2.45 + 1.10
= $3.55
Answer(s): $3.55