A trader buys tea for $1200 and sells it for $1550. Per sack of tea he makes a profit of $50. How many sacks of tea did he buy?

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To find the number of sacks of tea that the trader bought, we can use the given information. Let's break down the problem step by step:

1. Determine the profit per sack of tea:
The trader makes a profit of $50 per sack of tea.

2. Find the total profit:
The trader's total profit comes from the difference between the selling price and the buying price. In this case, the profit is $1550 - $1200 = $350.

3. Calculate the number of sacks of tea:
Since the profit per sack is $50, we can find the number of sacks by dividing the total profit by the profit per sack:
Number of sacks = Total profit / Profit per sack
Number of sacks = $350 / $50
Number of sacks = 7

Therefore, the trader bought 7 sacks of tea.