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gewusel gewusel
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6 years ago
A special purpose index has increased 155% during the last ten years. If the index is now 310, what was the index ten years ago?
Textbook 
Contemporary Business Mathematics with Canadian Applications

Contemporary Business Mathematics with Canadian Applications


Edition: 11th
Authors:
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wrote...
6 years ago
Let the index ten years ago be x.
x + 155% of x = 310
   x + 1.55x = 310
   2.55x = 310
   x = 121.56863
The index ten years ago was 121.56863.
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