breemarks3753 breemarks3753

22-12-2021
SAT

contestada

The cost of 8 pens is $2. 50. How much will 2 dozen cost?.

Respuesta :

roxy7788 roxy7788

22-12-2021

Answer:

$ 7.5

Explanation:

1. Common way:

if one pen costs $ x

8x=2.5

x=0.3125

2 dozen = 24

24*0.3125=7.5

2. shortcut:

2 dozen = 24 = 3 times of 8

because 8 pens cost $2.5, 2 dozen pens cost 3 times of $2.5, thus, $7.5

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