Consider a circle (radius R) to be made up of many concentric rings of radius r and thickness dr. Find the area, dA, of one of t
hese rings and integrate from 0 to R to get the area of the circle. Remember, the area of a very thin ring is just the circumference times the thickness. For something a bit more challenging, try to set it up as a sum of thin parallel bars rather than a sum of rings.
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so solve for "x", to see how much is the company paying for the purchase of 1 minute
now, they're plan to sell the minute for 8cents, how much is the profit?
that is, the difference from their cost of the cents to the planned selling price.
bear in mind, is 46,000,000 minutes, so whatever value you get for 1minute,
you need to multiply it for 46,000,000 to get the actual cost.
and the revenue from the sell of 8cents per minute, is of course, 8 * 46,000,000
profit = revenue - cost
or about a 2.4% chance.