how to solve step by step please

Question

12 ounces for 8.09

 dollars per ounce 

ounces per dollar.

Answer 1

12 oz for $8.09

that's 8.09/12 = about $0.6741666...

= about $.6741

= about 67 1/2 cents per ounce

buy one ounce for about 67 1/2 cents for an ounce.

67 1/2 times 12 = about $8.10, within 1 penny of $8.09

and

12/809 = about .015 ounces per dollar

one dollar or $1.00 buys .015 ounces