PSLE The airmail rates to two countries are shown. Raeann sent a letter weighing 81g to Laos and a letter weighing 24g to Canada by airmail. How much did she pay altogether?
Mass |
Laos |
Canada |
First 30g |
$0.95 |
$1.30 |
Every additional 15g |
$0.75 |
$0.45 |
Mass of the letter to Laos excluding the first 30 g
= 81 - 30
= 51 g
Sets of additional 15 g of the letter to Laos
= 51 ÷ 15
= 3 r 6
Sets of additional 15 g and part thereof the letter to Laos
= 3 + 1
= 4
Amount that Raeann paid for the letter to Laos
= 0.95 + 4 x 0.75
= 0.95 + 3.00
= $3.95
Amount that Raeann paid altogether
= 3.95 + 1.30
= $5.25
Answer(s): $5.25