822 recently purchased books were randomly selected from all recent book purchases over the Internet. The chart below shows the breakdown of the classification of the book type. 
What percentage of the books in the sample were either mystery or science fiction/fantasy?
Definitions:
Initial Investment
The amount of money used to start a project, purchase an asset, or initiate operations in a business.
Salvage Value
The projected sell-on value of a property when it reaches the end of its operational lifespan.
Internal Rate
Often referred to as Internal Rate of Return (IRR), it is the discount rate that makes the net present value of all cash flows from a particular project equal to zero.
Payback Period
The duration required for an investment to produce a sum of money or cash value equal to the investment's cost.
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