PSLE The airmail rates to two countries are shown. Esther sent a letter weighing 93g to Indonesia and a letter weighing 31g to Egypt by airmail. How much did she pay altogether?
Mass |
Indonesia |
Egypt |
First 40g |
$0.65 |
$1.20 |
Every additional 20g |
$0.25 |
$0.50 |
Mass of the letter to Indonesia excluding the first 40 g
= 93 - 40
= 53 g
Sets of additional 20 g of the letter to Indonesia
= 53 ÷ 20
= 2 r 13
Sets of additional 20 g and part thereof the letter to Indonesia
= 2 + 1
= 3
Amount that Esther paid for the letter to Indonesia
= 0.65 + 3 x 0.25
= 0.65 + 0.75
= $1.40
Amount that Esther paid altogether
= 1.40 + 1.20
= $2.60
Answer(s): $2.60