Mariel wanted to avail of a cellphone plan that offers a monthly fee of P=2,500.00. It includes

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Mariel wanted to avail of a cellphone plan that offers a monthly fee of P=2,500.00. It includes 240 minutes of call and charges 7.50 for each additional minute of usage. How much is her monthly cost incurred if she made an additional usage of 20 minutes of call?