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Phone bill calculation two months

925BeginnerAlgebra

Brazilian Mathematical Olympiad

Geni é cliente de uma companhia telefônica que oferece o seguinte plano: - tarifa mensal fixa de $R\$ 18,00$ - gratuidade em 10 horas de ligações por mês - $R\$ 0,03$ por cada minuto que exceder às 10 horas. Em janeiro, Geni usou seu telefone por 15 horas e 17 minutos, e em fevereiro por 9 horas e 55 minutos. Qual a despesa de Geni com telefone nesses dois meses? A) $R\$ 45,51$ B) $R\$ 131,10$ C) $R\$ 455,10$ D) $R\$ 13,11$ E) $R\$ 4,55$
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