Price of a lap-top is reduced by 25% to 637.50. what is the original price?

Since you took away 25% from the 100% value, we know 637.50 is 75% of the full value. So divide it by three to get the 25% value of 212.50, then multiply by 4 to get the full value of 850. So the original price was $850.

The original price is 478.13 (if you round it) because 637.50 times .25(its .25 because you need to turn it into a decimal) equals 159.375 then you subtract 637.50 by 159.375 and you get 478.125 then you round and get 478.13

First, think of what you know. you know that the number t the end of the equation will need to be subtracted because it is the money he lost from buying the lawn mower. and your first two weeks have negative profit, so that tells you that c and d are wrong. now you can plug any of the weeks into a and b to see which one works. i'll start with plugging week 1 into a.this isn't right because it says your answer for week one should be -90.so now we need to try the same thing with b.this one got you the right answer, (sometimes if you only check with one of the weeks multiple will work so you need to check with more of the weeks, but it worked out fine here)this means that b is the correct answer.let me know if you need more clarification. i hope this : )