PSLE The airmail rates to two countries are shown. Zara sent a letter weighing 74g to Laos and a letter weighing 10g to Egypt by airmail. How much did she pay altogether?
Mass |
Laos |
Egypt |
First 20g |
$0.95 |
$1.40 |
Every additional 10g |
$0.55 |
$0.40 |
Mass of the letter to Laos excluding the first 20 g
= 74 - 20
= 54 g
Sets of additional 10 g of the letter to Laos
= 54 ÷ 10
= 5 r 4
Sets of additional 10 g and part thereof the letter to Laos
= 5 + 1
= 6
Amount that Zara paid for the letter to Laos
= 0.95 + 6 x 0.55
= 0.95 + 3.30
= $4.25
Amount that Zara paid altogether
= 4.25 + 1.40
= $5.65
Answer(s): $5.65