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alexa's boutique is having a 30 off sale during which coats cost $50.00 and sweaters cost $60.00. On the day of the sale, alexas boutique sells a total of 80 coats and sweaters and earned a total of $4,450. On a regular day alexa sells 3/4 the number of coats and sweaters sold during the sle and earns a total of $3,180. Solving which of the following systems of equations yields the number of coat, c and the number of sweaters, s sold during a regular day