Question 1174967
as far as i can determine, 1 phillipine cent is equal to 1/100 * 1 phillipine peso.


therefore, plan C costs a basic fee of 2497.5 php per month + .05 php per message.


wee now have:


plan A costs 197.5 php per month plus 1 php per text message.
plan B costs 4510 php per month plus 0 php per test message.
plan C costs 2497.5 php per month plus .05 php per text message.


probably the quickest way to figure out which plan is cheaper would be to graph all 3 equations on the same graph.


your graph will look like this.


<img src = "http://theo.x10hosting.com/2021/021301.jpg" >



on the graph, plan A is red, plan B is blue, plan C is green.


from the graph, you can see that:


plan A is cheapest when the number of minutes are less than 24107.737.
plan C is cheapest when the number of minutes are greater than 24107.737.


plan A and plan C cost the same when the number of minutes are 24107.737.


i confirmed by formula that plan A and plan C cost the same at 2104.736842 minutes.
the figure on the graph is rounded.
plan A costs 497.5 + 2104.736842 = 2602.236842
plan C costs 2497 + .05 * 2104.736842 = 2602.236842.
they're the same.


the formula was 497.5 + x = 2497 + .05 * x
subtract .05 * x from both sides of the equation and subtract 497.5 from both sides of the equation to get:
.95 * x = 1999.5
solve for x to get:
x = 1999.5 / .95 = 2104.736842.