Risa spent $76 on some staplers, notebooks and pencils. The number of staplers she bought was ¹₂ the number of notebooks. The number of pencils she bought was ³₅ the number of notebooks. The ratio of the amount of money she spent on the staplers, notebooks and pencils was 7 : 7 : 5. The notebooks were sold at 5 for $7. Find the price of 1 stapler.

Amount spent
Staplers	Notebooks	Pencils	Total
7 u	7 u	5 u	$76

Total amount that Risa spent on staplers, notebooks and pencils
= 7 u + 7 u + 5 u
= 19 u

19 u = 76

1 u = 76 ÷ 19 = 4

Amount that Risa spent on notebooks
= 7 u
= 7 x 4
= $28

Number of sets of notebooks of 5 bought
= 28 ÷ 7
= 4

Number of notebooks that Risa bought
= 4 x 5
= 20

Number of items bought
Staplers	Notebooks	Pencils	Total
1x5	2x5
	5x2	3x2
5 p	10 p	6 p	21 p

The number of notebooks bought is repeated.  Make the number of notebooks bought is the same.  LCM of 2 and 5 is 10.

Number of notebooks that Risa bought = 10 p

10 p = 20

1 p = 20 ÷ 10 = 2

Number of staplers that Risa bought
= 5 p
= 5 x 2
= 10

Amount that Risa spent on staplers
= 7 u
= 7 x 4
= $28

Price of 1 stapler
= 28 ÷ 10
= $2.80

Answer(s): $2.80