 
Arturo O. answered  11/19/19
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With a 15% tip included, you paid 100% + 15% of the cost, which is 115% of the cost, or 1.15 times the cost.
$29.90 = 1.15 x cost
cost without tip = $29.90 / 1.15 = $26
 
     
             
                     
                    