PSLE The airmail rates to two countries are shown. Tammy sent a letter weighing 62g to Indonesia and a letter weighing 25g to Switzerland by airmail. How much did she pay altogether?
Mass |
Indonesia |
Switzerland |
First 30g |
$0.75 |
$1.50 |
Every additional 15g |
$0.55 |
$0.55 |
Mass of the letter to Indonesia excluding the first 30 g
= 62 - 30
= 32 g
Sets of additional 15 g of the letter to Indonesia
= 32 ÷ 15
= 2 r 2
Sets of additional 15 g and part thereof the letter to Indonesia
= 2 + 1
= 3
Amount that Tammy paid for the letter to Indonesia
= 0.75 + 3 x 0.55
= 0.75 + 1.65
= $2.40
Amount that Tammy paid altogether
= 2.40 + 1.50
= $3.90
Answer(s): $3.90