PSLE The airmail rates to two countries are shown. Zara sent a letter weighing 67g to Indonesia and a letter weighing 23g to Switzerland by airmail. How much did she pay altogether?
Mass |
Indonesia |
Switzerland |
First 30g |
$0.65 |
$1.40 |
Every additional 15g |
$0.45 |
$0.60 |
Mass of the letter to Indonesia excluding the first 30 g
= 67 - 30
= 37 g
Sets of additional 15 g of the letter to Indonesia
= 37 ÷ 15
= 2 r 7
Sets of additional 15 g and part thereof the letter to Indonesia
= 2 + 1
= 3
Amount that Zara paid for the letter to Indonesia
= 0.65 + 3 x 0.45
= 0.65 + 1.35
= $2.00
Amount that Zara paid altogether
= 2.00 + 1.40
= $3.40
Answer(s): $3.40