Explanation:
for % questions always find 100% and/or 1%. everything else can be calculated based on these.
100% = $115
1% = 100%/100 = 115/100 = $1.15
how many % are $21 ?
as many as times 1.15 (1%) fits into 21 :
21/1.15 = 18.26086957...% ≈ 18.26%
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