PSLE The airmail rates to two countries are shown. Esther sent a letter weighing 108g to Phillippines and a letter weighing 46g to Sweden by airmail. How much did she pay altogether?
Mass |
Phillippines |
Sweden |
First 50g |
$0.85 |
$1.20 |
Every additional 25g |
$0.55 |
$0.50 |
Mass of the letter to Phillippines excluding the first 50 g
= 108 - 50
= 58 g
Sets of additional 25 g of the letter to Phillippines
= 58 ÷ 25
= 2 r 8
Sets of additional 25 g and part thereof the letter to Phillippines
= 2 + 1
= 3
Amount that Esther paid for the letter to Phillippines
= 0.85 + 3 x 0.55
= 0.85 + 1.65
= $2.50
Amount that Esther paid altogether
= 2.50 + 1.20
= $3.70
Answer(s): $3.70