A tennis racket at Sport City costs $180 and is discounted 15%. The same model racket costs $200 at Tennis World and is on sale for 20% off. Which store is offering the better deal?(Give evidence or you won't get the points?

Sport City has the better deal

Step-by-step explanation:

At Sport City, the cost of the tennis racket would be:

180  ⋅  0.85 = $ 153

(I used 0.85 instead of 0.15 because 0.15 is finding the discount amount, not the actual amount after the discount. Got 0.85 by subtracting 0.15 from 1.)

At Tennis World, the cost of the tennis racket would be:

$ 200 ⋅  0.80 = $ 160

(I used 0.80 instead of 0.20 because 0.20 is finding the discount amount, not the actual amount after the discount. Got 0.80 by subtracting 0.20 from 1.)

Sport City has the better deal because after the discount it is selling the racket for  

$ 153

, while Tennis World is selling it for  

$ 160

. Tennis World is selling it for  

$ 7

more than Sport City.

Sport City

Step-by-step explanation:

180 * .15 = 27

180-27 = 153

200 * .2 = 40

200 - 40 = 160

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies