The value of a car goes down by 10% each year. a car costs £40000 new. how much is it worth after:
ai) 1 year
ii) 2 years
b) after how many years is it worth less than its original price?
does the answer to part b increase, decrease, or stay the same when
ci) the cost of the new car is changed to £12000
ii) the rate of decrease is changed to 20%

The answer is a because i went through all the other ones that it didn’t come out right

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 : )