PSLE The airmail rates to two countries are shown. Kimberly sent a letter weighing 78g to Laos and a letter weighing 16g to Egypt by airmail. How much did she pay altogether?
Mass |
Laos |
Egypt |
First 20g |
$0.95 |
$1.30 |
Every additional 10g |
$0.65 |
$0.55 |
Mass of the letter to Laos excluding the first 20 g
= 78 - 20
= 58 g
Sets of additional 10 g of the letter to Laos
= 58 ÷ 10
= 5 r 8
Sets of additional 10 g and part thereof the letter to Laos
= 5 + 1
= 6
Amount that Kimberly paid for the letter to Laos
= 0.95 + 6 x 0.65
= 0.95 + 3.90
= $4.85
Amount that Kimberly paid altogether
= 4.85 + 1.30
= $6.15
Answer(s): $6.15