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Using the percentage concept, it is found that 40% of Alberto’s income is used to pay for his rent and groceries.
The percentage of an amount a over a total amount b is given by a multiplied by 100% and divided by b, that is:
[tex]P = \frac{a}{b} \times 100\%[/tex]
In this problem:
Then, the percentage is given by:
[tex]P = \frac{1280}{3200} \times 100\% = 40\%[/tex]
More can be learned about the percentage concept at https://brainly.com/question/10491646