A spends 80% of her income. When her income is increased by 30%, she increases her expenditure by 30%. By what percentage are her saving increased or decreased?

Answer: A spends 80% of her income. When her income is increased by 30%, she increases her expenditure by 30%. Her saving will be increased by 30%.

Let’s assume the income to be A. When A is 100 then Expenditure will be equal to 80% of 100 which means this will be equal to 80 and thus Savings will become 100 – 80 because income – expenditure is equal to saving. So, the saving will be 20 in such cases. Now when income will increase by 30% the New income will become 100 + 30% of 100 which is 100 + 30. The new income will be 130. Now when the expenditure is increased by 30% then new expenditure will be calculated which is equal to 80 + 30% of 80. This makes it 80 + 24 is equal to 104. While calculating new savings we can apply the formula. According to which 130 – 104 is equal to 26 Increment in savings. To calculate the percent increment subtract 20 from 26. The result of 26 – 20 will be equal to 6 now the percent increment will be 6/20 × 100. This means the percentage increment will be 30% thus the correct answer is 30%. In the question, the saving is increased by 30%.

Summary:

A spends 80% of her income. When her income is increased by 30%, she increases her expenditure by 30%. By what percentage is her saving increased or A spends 80% of her income. When her income is increased by 30%, she increases her expenditure by 30%. By what percentage are her saving increased or decreased?

A spends 80% of her income. When her income is increased by 30%, she increases her expenditure by 30%. Her saving will be increased by 30%.

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