Answer:
you must use alltitude or hight
Step-by-step explanation:
Altitude or height
It’s in many different forms:20 or .20 or 20%
The answer to your problem is 17
Percent of decrease :
Original - New / Original
so...
80 - 52 / 80 ---->
28/80
.35 multiply by 100 to get percent
35% increase Hope I helped if you have any questions let me know! :)