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Mathematics, 13.10.2019 19:00 WintryTurtle

Aphone company offers two monthly plans. plan a costs $30 plus an additional $0.15 for each minute of calls. plan b costs $16 plus an additional $0.20 for each minute of calls.
for what amount of calling do the two plans cost the same?
what is the cost when the two plans cost the same?

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