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Since you choose to extend this far beyond last Monday, I assume you still want to know what you did wrong?

For A) Read carefully. The tax is 20% ON THE REMAINDER, not 20% of her annual salary. "Remainder" means the result of a subtraction. The "tax allowance" is what she does NOT pay tax on. What two numbers must be subtracted to find what she does pay tax on? I assume that you know what 20% means (multiply by 20 and divide by 100).

For B) you have the right idea, just calculate it using the correct number from (A).

For C) I have no idea what you are doing. If she recieved 6800 each month, in only 3 months she would have 6800+6800+6800>19200, but there are more than 3 months in a year! How many? You need to make her (correct) annual income from part B into that many equal monthly pieces. Which arithmetic operation does that (makes equal pieces)?

Then D) is just calculating a percentage, which you appear to have done successfully done already (with the wrong number) in (A). Do you want the monthly amount (using C) or the annual amount (using D)?

For E) Read carefully. "Increase" means that the 7% (multiply7 and divide 100) is to be ADDED to the original salary. Then just repeat (A) and (B) with this new annual salary.

to transform a decimals in to proportion you progression the decimal factor 2 places to the excellent, so which you will then have 430% to transform 19.6% right into a decimal, you progression the decimal factor 2 plaes to the left, so which you will then have .196