Calculation of income tax liability

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Can anyone help with the following computation.

Employment £17,000
Saving income £10,000
Dividends £20,000

Workings so far.

Non-saving income £6000.00 *20% =£1200.00
Savings income £500.00 higher allowance 0%
remainder £9500.00 *20% = £1900.00

Now I am stuck with the working out of the dividends, I am not sure how to undertake this part
If you can break it down I will be most grateful
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