Question 259736
PLAN A:
If t <= 20, then 1$
If t> 20, then .07*(x-20)
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PLAN B
if t > 0, then .06t
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To be the same cost we set them equal and get
.07*(t-20) + 1 = .06t
using distributive property, we get
,07t -1.4 + 1 = .06t
combining like terms, we get
.07t -.4 = .06t
subtracting .07t, we get
-.4 = -.01t
dividing we get
t = 40
So, we have a 40 minute call being the same cost.