The price of the tea was twice the price of the cheese, so the cheese cost was 10 / 2 = $<<10/2=5>>5.
The price of the butter was 80/100 * 5 = $<<80/100*5=4>>4.
If the bread was 2 times cheaper than butter, that means it cost 4 / 2 = $<<4/2=2>>2.
That means Ursula paid for all her shopping 2 + 4 + 5 + 10 = $<<2+4+5+10=21>>21.
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