math ..PLEASE HELP !!!

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A local bank reports that 70% of its customers maintain a chequing acct, 50% have a savings acct and 40% have both.If a customer was chosen at random
a) what is the probability customer has a chequing or saving acct
b)probability the selected customer has neither
c)probability the customer has a chequing but no savings
d) probability the customer has exactly one of the two types of accounts?

sorry, these are all percentages

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