PSLE The airmail rates to two countries are shown. Roshel sent a letter weighing 71g to Indonesia and a letter weighing 26g to Egypt by airmail. How much did she pay altogether?
Mass |
Indonesia |
Egypt |
First 30g |
$0.95 |
$1.10 |
Every additional 15g |
$0.75 |
$0.35 |
Mass of the letter to Indonesia excluding the first 30 g
= 71 - 30
= 41 g
Sets of additional 15 g of the letter to Indonesia
= 41 ÷ 15
= 2 r 11
Sets of additional 15 g and part thereof the letter to Indonesia
= 2 + 1
= 3
Amount that Roshel paid for the letter to Indonesia
= 0.95 + 3 x 0.75
= 0.95 + 2.25
= $3.20
Amount that Roshel paid altogether
= 3.20 + 1.10
= $4.30
Answer(s): $4.30