PSLE The airmail rates to two countries are shown. Lucy sent a letter weighing 78g to Indonesia and a letter weighing 22g to Egypt by airmail. How much did she pay altogether?
Mass |
Indonesia |
Egypt |
First 30g |
$0.55 |
$1.30 |
Every additional 15g |
$0.35 |
$0.35 |
Mass of the letter to Indonesia excluding the first 30 g
= 78 - 30
= 48 g
Sets of additional 15 g of the letter to Indonesia
= 48 ÷ 15
= 3 r 3
Sets of additional 15 g and part thereof the letter to Indonesia
= 3 + 1
= 4
Amount that Lucy paid for the letter to Indonesia
= 0.55 + 4 x 0.35
= 0.55 + 1.40
= $1.95
Amount that Lucy paid altogether
= 1.95 + 1.30
= $3.25
Answer(s): $3.25