SOLUTION: Mr. chittocks political button collection currently has 840 buttons. This represents a 12% increase over his total collection of 3 years ago. Determine how many buttons were in his

Question 1135047: Mr. chittocks political button collection currently has 840 buttons. This represents a 12% increase over his total collection of 3 years ago. Determine how many buttons were in his collection 3 years ago
Answer by ikleyn(52930) (Show Source): You can put this solution on YOUR website!
.

Let x be the number three years ago.


According to the condition, this number "x" is the base for the comparison,


so your equation is


    x*(1+0.12) = 840

    1.12x = 840

     x = 840/1.12 = 750.


ANSWER.  3 years ago the collection was 750 buttons.

Solved.

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    - Percentage word problems (Type 2 problems, Finding the Rate)
    - Percentage word problems (Type 3 problems, Finding the Base)
    - More complicated percentage problems
    - Problems on percentage that lead to unexpected results
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