Maths Problem, Please Help?

Please can someone answer these for me?:)
A clothes shop has a sale. All the original prices are reduced by 24% to give the sale price. The sale price of a jacket is £36.86
Work out the original price of the jacket..
And…
In a sale all prices are reduced by 16% . Alan buys a shaver in the sale for £21.
How much does he save by buying it in the sale?
And finally..
A tourist buys a stereo which costs £155.19, including VAT at 17.5%
Tourists do not have to pay VAT. How much does the tourist pay?
Thank you so much if you help me! I really need help, please everyone:)

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