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SmarticalParticals
First find 115% of 10 then add it to 10.

115% × 10=
1.15×10 = $11.50

This is the markup

Now add it to the cost to get the marked up price

11.50 + 10 = $21.50

*note- you were not clear whether you wanted the amount of markup or the new marked up price.
apologiabiology
ok so markup is 115%
percent emasn parts out of 100
115%=115/100=1.15
115% of 10
'of' means multipy
1.15 times 10=11.50
markup is what you add
10+11.5=21.5

new price=$21.50