PSLE The airmail rates to two countries are shown. Ivory sent a letter weighing 56g to Phillippines and a letter weighing 11g to Sweden by airmail. How much did she pay altogether?
Mass |
Phillippines |
Sweden |
First 20g |
$0.65 |
$1.90 |
Every additional 10g |
$0.45 |
$0.85 |
Mass of the letter to Phillippines excluding the first 20 g
= 56 - 20
= 36 g
Sets of additional 10 g of the letter to Phillippines
= 36 ÷ 10
= 3 r 6
Sets of additional 10 g and part thereof the letter to Phillippines
= 3 + 1
= 4
Amount that Ivory paid for the letter to Phillippines
= 0.65 + 4 x 0.45
= 0.65 + 1.80
= $2.45
Amount that Ivory paid altogether
= 2.45 + 1.90
= $4.35
Answer(s): $4.35