PSLE The airmail rates to two countries are shown. Roshel sent a letter weighing 53g to Phillippines and a letter weighing 11g to Sweden by airmail. How much did she pay altogether?
Mass |
Phillippines |
Sweden |
First 20g |
$0.85 |
$1.50 |
Every additional 10g |
$0.55 |
$0.55 |
Mass of the letter to Phillippines excluding the first 20 g
= 53 - 20
= 33 g
Sets of additional 10 g of the letter to Phillippines
= 33 ÷ 10
= 3 r 3
Sets of additional 10 g and part thereof the letter to Phillippines
= 3 + 1
= 4
Amount that Roshel paid for the letter to Phillippines
= 0.85 + 4 x 0.55
= 0.85 + 2.20
= $3.05
Amount that Roshel paid altogether
= 3.05 + 1.50
= $4.55
Answer(s): $4.55