PSLE The airmail rates to two countries are shown. Fiona sent a letter weighing 86g to Thailand and a letter weighing 29g to Switzerland by airmail. How much did she pay altogether?
Mass |
Thailand |
Switzerland |
First 30g |
$0.55 |
$1.10 |
Every additional 15g |
$0.25 |
$0.45 |
Mass of the letter to Thailand excluding the first 30 g
= 86 - 30
= 56 g
Sets of additional 15 g of the letter to Thailand
= 56 ÷ 15
= 3 r 11
Sets of additional 15 g and part thereof the letter to Thailand
= 3 + 1
= 4
Amount that Fiona paid for the letter to Thailand
= 0.55 + 4 x 0.25
= 0.55 + 1.00
= $1.55
Amount that Fiona paid altogether
= 1.55 + 1.10
= $2.65
Answer(s): $2.65