Eric Nicholas K's answer to Moshi's Secondary 1 Maths Singapore question.
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Price after 8% tax is basically (100 + 8) = 108% of the price before tax, so the price before tax is price after tax divided by 108%.
The price before tax is also the discounted price, and the discounted price is 80% of the original price, so the original price is the discounted price divided by 80%.
Therefore, the original price is p divided by 108% divided by 80% = p divided by (the product of 1.08 and 0.8).
The price before tax is also the discounted price, and the discounted price is 80% of the original price, so the original price is the discounted price divided by 80%.
Therefore, the original price is p divided by 108% divided by 80% = p divided by (the product of 1.08 and 0.8).
Date Posted:
5 years ago
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