A family in Singapore part 21 (Math Question)

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The blog postings are about the Singapore Math. The readers can learn from the postings on Solving Singapore Primary School Mathematics. You or your kids will learn the skills of dealing with Math modeling, Problem Sum from Lower Primary School to Upper Primary School level in Singapore school after reading the blog postings. This posting is an upper primary school math question on Percentage and Problem Sum.

You can click here and read the posting on A family in Singapore about Sarin’s family.

You should read the posting on Sarin learns Average Number, Percentage and Charting in school (Math Concept) to understand the concept of Percentage.

Upper primary school mathematics question UPQ266

Sarin’s father gave \$1200 of his monthly salary to his mother as their family monthly household expenses. He saved the rest of his salary. If he deduced the household expenses by 14%, his savings increased by 20%. How much was Sarin’s father monthly salary?

Solution:

14% reduction from the \$1200 spending

100% ==> 1200

1% ==> 12

14% ==> 12 × 14 = \$168

Amount reduced in spending = \$168

Saving increased by \$168 is 20%

20% ==> 168

10% ==> 84

100% ==> \$840

The amount of saving = 168 × 100/20 = \$840

Sarin’s father monthly salary = 1200 + 840 = \$2040

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