Question

It is estimated the value of a new car decreases by 30% after one year of ownership. Find the

value of a car after one year of ownership if the cost of the new car was $24,300.

Answer 1

Answer: 17 010

If $24300 is the 100% (full price), then after year it would be 70% of that cost (because 100% decreases by 30% in a year). We can cross multiply the values:
$24300 100%
x 70%
so cross multiplying: 100 with x and 24300 with 70
-> 100x = 1701000
so the x will be 17010