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Markup = 1,000,000 x 48% / 520,000

Note: Gross profit = 1,000,000 (projected annual sales) x 48% (profit margin) / 520,000 {1,000,000 - 480,000 (48% profit margin)}

Therefore,

Markup = 480,000 / 520,000

Markup = 92.3 percent
Now,

B 100,000 (that we calculated earlier - 10% of annual projected sales of 1M) x 92.3 percent = adjusted low budget

= B 92,308 (it means that you must spend at least 92,308 baht / year on your advertisement)

Repeat the same step by replacing 100,000 with 120,000 and 10 percent with 12 percent to get the adjusted high budget for the year.

= B 120,000 x 92.3 percent

= B 110,760 (it means the max you can spend is 110,760 baht / year on your advertisement)