Answer:
65.532cm of rainfall over 12 months
Step-by-step explanation
7 x 6 = 42 x 5 = 210 x 8 = 1,680 x 4 = [ 6,720 ]
The formula of the volume of a cylinder:

We have:

and

substitute:
Answer: The area of a base of the cylinder is equal 45 dm².
Well 19 would be 399 and for 20. the discount is 12.87 and the price of it after the discount is 26.13