PSLE The airmail rates to two countries are shown. Pamela sent a letter weighing 62g to Laos and a letter weighing 27g to Egypt by airmail. How much did she pay altogether?
Mass |
Laos |
Egypt |
First 30g |
$0.55 |
$1.80 |
Every additional 15g |
$0.15 |
$0.70 |
Mass of the letter to Laos excluding the first 30 g
= 62 - 30
= 32 g
Sets of additional 15 g of the letter to Laos
= 32 ÷ 15
= 2 r 2
Sets of additional 15 g and part thereof the letter to Laos
= 2 + 1
= 3
Amount that Pamela paid for the letter to Laos
= 0.55 + 3 x 0.15
= 0.55 + 0.45
= $1.00
Amount that Pamela paid altogether
= 1.00 + 1.80
= $2.80
Answer(s): $2.80