mr chen buys a fancy latte coffee every day for $3.50. how much does it cost him to buy coffee every 30 days?
To find out how much it costs Mr. Chen to buy coffee every 30 days, we need to multiply the cost of the coffee per day by the number of days in 30 days.
The cost of coffee per day is $3.50.
The number of days in 30 days is 30.
Therefore, the cost of coffee every 30 days is $3.50 x 30 = $<<3.5*30=105>>105. Answer: \boxed{105}.