PSLE The airmail rates to two countries are shown. Jaslyn sent a letter weighing 54g to Laos and a letter weighing 14g to Switzerland by airmail. How much did she pay altogether?
Mass |
Laos |
Switzerland |
First 20g |
$0.95 |
$1.60 |
Every additional 10g |
$0.65 |
$0.70 |
Mass of the letter to Laos excluding the first 20 g
= 54 - 20
= 34 g
Sets of additional 10 g of the letter to Laos
= 34 ÷ 10
= 3 r 4
Sets of additional 10 g and part thereof the letter to Laos
= 3 + 1
= 4
Amount that Jaslyn paid for the letter to Laos
= 0.95 + 4 x 0.65
= 0.95 + 2.60
= $3.55
Amount that Jaslyn paid altogether
= 3.55 + 1.60
= $5.15
Answer(s): $5.15