PSLE The airmail rates to two countries are shown. Shiyun sent a letter weighing 88g to Indonesia and a letter weighing 29g to Sweden by airmail. How much did she pay altogether?
Mass |
Indonesia |
Sweden |
First 30g |
$0.75 |
$1.80 |
Every additional 15g |
$0.45 |
$0.70 |
Mass of the letter to Indonesia excluding the first 30 g
= 88 - 30
= 58 g
Sets of additional 15 g of the letter to Indonesia
= 58 ÷ 15
= 3 r 13
Sets of additional 15 g and part thereof the letter to Indonesia
= 3 + 1
= 4
Amount that Shiyun paid for the letter to Indonesia
= 0.75 + 4 x 0.45
= 0.75 + 1.80
= $2.55
Amount that Shiyun paid altogether
= 2.55 + 1.80
= $4.35
Answer(s): $4.35