PSLE The airmail rates to two countries are shown. Cathy sent a letter weighing 101g to Phillippines and a letter weighing 44g to New Zealand by airmail. How much did she pay altogether?
Mass |
Phillippines |
New Zealand |
First 50g |
$0.75 |
$1.40 |
Every additional 25g |
$0.55 |
$0.40 |
Mass of the letter to Phillippines excluding the first 50 g
= 101 - 50
= 51 g
Sets of additional 25 g of the letter to Phillippines
= 51 ÷ 25
= 2 r 1
Sets of additional 25 g and part thereof the letter to Phillippines
= 2 + 1
= 3
Amount that Cathy paid for the letter to Phillippines
= 0.75 + 3 x 0.55
= 0.75 + 1.65
= $2.40
Amount that Cathy paid altogether
= 2.40 + 1.40
= $3.80
Answer(s): $3.80