PSLE The airmail rates to two countries are shown. Vanessa sent a letter weighing 57g to Phillippines and a letter weighing 17g to New Zealand by airmail. How much did she pay altogether?
Mass |
Phillippines |
New Zealand |
First 20g |
$0.85 |
$1.80 |
Every additional 10g |
$0.65 |
$0.80 |
Mass of the letter to Phillippines excluding the first 20 g
= 57 - 20
= 37 g
Sets of additional 10 g of the letter to Phillippines
= 37 ÷ 10
= 3 r 7
Sets of additional 10 g and part thereof the letter to Phillippines
= 3 + 1
= 4
Amount that Vanessa paid for the letter to Phillippines
= 0.85 + 4 x 0.65
= 0.85 + 2.60
= $3.45
Amount that Vanessa paid altogether
= 3.45 + 1.80
= $5.25
Answer(s): $5.25