To calculate the cost of buying coffee every 30 days, we can multiply the cost of the coffee per day ($3.50) by the number of days in 30 days.
$3.50/day * 30 days = $<<3.5*30=105>>105
Therefore, it costs Mr. Chen $105 to buy coffee every 30 days.
Mr Chen buys a fancy latte coffee everyday for 3.50 how much does it cost him to buy coffee every 30 days
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