Abookstore marks up the cost of a book from $6 to $10. what was the percent increase? a) 66.7% b) 34% c) 16% d) 2%

Cost of a book has been increased from $6 to $10.

So, increase in cost= 10-6=4.

Now percent increase=

=

=

=0.667*100%

= 66.7%

i can't solve unless i know what the line is

step-by-step explanation:

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