Martin finds a shirrt on sale for 10% off at a department store. the original price was $20. martin must also pay 8.5% sales tax. how much is the shirt after taxes are applied?

Me with this one question, and i'll upvote the brainliest answer

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?

What number line represents the solution set for the inequality -1/2 greater than or equal to 4