Before discount 100% After20% discount-$4000(80%) 100%---$5000 ($4000/80 x 100)

Total price before discount = $4000 times 100/80 = $5000 Price of fridge before discount = $5000 times 60/160 = $1875 (ans)

Refrigerator-60%-- 6u TV-100%- 10u 16u=$5000 u= $312.50 6u-$1875(answer)

Thanks Izam Marwasi & Xavier Sng!

Pleasure to help. Regards

I found the original total to be $5000 similar to the above. However I changed 60% to 3/5. so the refrigerator cost 3u and the tv cost 5u. So 8u=5000, u = 625. So the refrigerator cost 3(625) = 1875.

Very good stuff, Maggie Lukes.

New length is 5/4 of the old length. New width is 13/10 of the old width. 5/4 times 13/10 = 65/40 65/40 - 40/40 = 25/40 25/40 times 100% = 62.5% (ans)

Leonie, your answer is very close to being correct. Your only mistake is calculating the answer at the end. 25/40 x 100 = 125/2 = 62.5%.

Good observation, Maggie Lukes! Leonie R Tan, your child knows how to solve this problem. :)

Hi Maggie and Xavier, haha I m the one who doesn't understand why the ratio ( not the length) can be used to times....

I see. Since the question does not provide the actual dimensions, and the required answer is the increment of area in terms of percentage, the idea of area derived from the percentage change or fractional change in the length and width is employed. Please allow me to provide an example below.

Ok Tks Xavier! I will have a good look at this when I get home. Tks again!

Pleasure is mine. Regards

It is spot on.

Elegant. I solved it using decimals and algebra, but your method using equivalent fractions is interesting.

Thanks for the answers..

A pleasure to help. Regards

Maggie Lukes: very often the numbers in the questions afford many opportunities to employ very simple methods to solve the problem. The trick is to spot them. :)