PSLE The airmail rates to two countries are shown. Linda sent a letter weighing 74g to Thailand and a letter weighing 26g to Switzerland by airmail. How much did she pay altogether?
Mass |
Thailand |
Switzerland |
First 30g |
$0.55 |
$1.60 |
Every additional 15g |
$0.15 |
$0.50 |
Mass of the letter to Thailand excluding the first 30 g
= 74 - 30
= 44 g
Sets of additional 15 g of the letter to Thailand
= 44 ÷ 15
= 2 r 14
Sets of additional 15 g and part thereof the letter to Thailand
= 2 + 1
= 3
Amount that Linda paid for the letter to Thailand
= 0.55 + 3 x 0.15
= 0.55 + 0.45
= $1.00
Amount that Linda paid altogether
= 1.00 + 1.60
= $2.60
Answer(s): $2.60