PSLE The airmail rates to two countries are shown. Olivia sent a letter weighing 58g to Malaysia and a letter weighing 13g to Sweden by airmail. How much did she pay altogether?
Mass |
Malaysia |
Sweden |
First 20g |
$0.55 |
$1.80 |
Every additional 10g |
$0.15 |
$0.70 |
Mass of the letter to Malaysia excluding the first 20 g
= 58 - 20
= 38 g
Sets of additional 10 g of the letter to Malaysia
= 38 ÷ 10
= 3 r 8
Sets of additional 10 g and part thereof the letter to Malaysia
= 3 + 1
= 4
Amount that Olivia paid for the letter to Malaysia
= 0.55 + 4 x 0.15
= 0.55 + 0.60
= $1.15
Amount that Olivia paid altogether
= 1.15 + 1.80
= $2.95
Answer(s): $2.95