F.3 Percentage II
2007-10-07 10:35 pm
2) The term mark is the sum of 30% of the test mark and 70% of examination mark . In the first term , Johnnie got 60 marks in the test and 70 marks in examination. Find the percentage change in Johnnie 's second term mark when comparing with his first term mark.
回答 (2)
2007-10-07 11:07 pm
✔ 最佳答案
In the first term, Johnnie total marks should be= 60×30% + 70×70%
= 18 + 49
= 67
In the second term, Johhine total marks should be:
= 60×30%×(1﹣20%) + 70×70%×(1﹣10%)
= 60×0.3×0.8+ 70×0.7×0.9
= 14.4 + 44.1
= 58.5
∴the percentage changes in Johnnie 's second term mark when comparing with his first term mark
= (the second term mark﹣the first term mark)/the first term mark×100%
= (58.5﹣ 67) / 67×100%
= -8.5 / 67×100%
= -12.7% (correct to 3 sig. fig.)
2007-10-07 10:48 pm
What is the marks in second term? Can't compare without the marks.
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