PSLE The airmail rates to two countries are shown. Betty sent a letter weighing 62g to Phillippines and a letter weighing 17g to Egypt by airmail. How much did she pay altogether?
Mass |
Phillippines |
Egypt |
First 20g |
$0.85 |
$1.20 |
Every additional 10g |
$0.55 |
$0.40 |
Mass of the letter to Phillippines excluding the first 20 g
= 62 - 20
= 42 g
Sets of additional 10 g of the letter to Phillippines
= 42 ÷ 10
= 4 r 2
Sets of additional 10 g and part thereof the letter to Phillippines
= 4 + 1
= 5
Amount that Betty paid for the letter to Phillippines
= 0.85 + 5 x 0.55
= 0.85 + 2.75
= $3.60
Amount that Betty paid altogether
= 3.60 + 1.20
= $4.80
Answer(s): $4.80