Here's the question you clicked on:
ms.hi
Estimate a 15% tip for a $26.80 meal
$4.00 (estimated) $4.02 (exact) 15% = 10% and 5% 10% of $26.80 = $2.68 (just move decimal point one place to the left) 5% of $26.80 = $1.34 (half of above) Rounded to one decimal point: $2.68 is $2.50 and $1.34 is $1.50. $2.50 + $1.50 = $4
10% is around $2.70 20% is arond $5.40 You need the middle of those, so around $4
$1.35 $2.70 $4.05 $31.05 these are the multiple choices so c?