Eric Nicholas K's answer to Mandy's Primary 6 Maths Percentage Singapore question.
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This is one way to approach this question.
We must realise that for an unchanged salary, an increase in spending will result in a decrease in savings by the same amount.
Beyond that, we must understand how percentages work.
10% increase in spending corresponds to a $180 increase in spending.
This means that there is a $180 decrease in savings, which corresponds to a 20% decrease in savings, from an initial of 100% in savings to 80% of the old savings amount.
20% —> $180
1% —> $9
100% —> $900
meaning that the initial savings amount is $900.
Add this to the initial $1800 spending and we find that the salary is $2700.
We must realise that for an unchanged salary, an increase in spending will result in a decrease in savings by the same amount.
Beyond that, we must understand how percentages work.
10% increase in spending corresponds to a $180 increase in spending.
This means that there is a $180 decrease in savings, which corresponds to a 20% decrease in savings, from an initial of 100% in savings to 80% of the old savings amount.
20% —> $180
1% —> $9
100% —> $900
meaning that the initial savings amount is $900.
Add this to the initial $1800 spending and we find that the salary is $2700.
Date Posted:
4 years ago
Very Helpfull. Thank so much.
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