Multiplying 0.7 by the original price will work...
If you divide the cost by 100, subtract 30 from 100, you will be left with 70% times the 1/100
70% is also expressed as 0.7, since 7/10=70/100
Hope this helps!
Answer:
15.7
Step-by-step explanation:
Lets take a = 50.
Area of Sector =

Answer:
when
, 
the slope is 0
Step-by-step explanation:
There isn't much to explain.