Calculate the marginal cost of producing the suit. In an ideal, competitive world, the marginal cost = price, so this will be our base. Then you simply find 200 - marginal cost and this provides you the markup.
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-37.5%
The sale price is $270.00
2.40 (A+)
7% of 400.00 = 28.00
The tax is 6.1% of 180 = 180*6.1/100 = 10.98