PSLE The airmail rates to two countries are shown. Yen sent a letter weighing 86g to Vietnam and a letter weighing 24g to Egypt by airmail. How much did she pay altogether?
Mass |
Vietnam |
Egypt |
First 30g |
$0.85 |
$1.10 |
Every additional 15g |
$0.55 |
$0.35 |
Mass of the letter to Vietnam excluding the first 30 g
= 86 - 30
= 56 g
Sets of additional 15 g of the letter to Vietnam
= 56 ÷ 15
= 3 r 11
Sets of additional 15 g and part thereof the letter to Vietnam
= 3 + 1
= 4
Amount that Yen paid for the letter to Vietnam
= 0.85 + 4 x 0.55
= 0.85 + 2.20
= $3.05
Amount that Yen paid altogether
= 3.05 + 1.10
= $4.15
Answer(s): $4.15