A laptop normally costs $660 and is on sale for 45% off.how much is the sale price before tax?
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Answer:
See the first attachment. The numbers indicate the order 1=least, 5=greatest.
Step-by-step explanation:
This is a calculator exercise. Put the numbers in your calculator and have it tell you the result. Don't forget that (ab)/(cd) = ab/c/d if you don't use parentheses.
See the 2nd and 3rd attachments for the values of the expressions.
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You can estimate values as follows (top to bottom):
1. 4·9·10^(8-5) ≈ 36·10^3
2. 7·8·10^(5-2) ≈ 56·10^3
3. (7·9)/(8·4)·10^(5-7+2+3) ≈ 2·10^3
4. (8·10)/(8·6)·10^(4+1-11+8) ≈ 1.7·10^2
5. (2·6)/(3·5)·10^(4+3+2-2) ≈ 0.8·10^7
These are crude estimates, but sufficiently close to put the numbers in order as required.
