Final answer:
The choir will raise a profit of $650.
Step-by-step explanation:
To calculate the profit raised by the choir, we need to find the total revenue and subtract the cost. The choir is selling 100 coupon books for $10 each, so the total revenue from selling all the books is $10 * 100 = $1000. The cost of purchasing the books for the choir is $350. To find the profit, we subtract the cost from the total revenue: $1000 - $350 = $650. Therefore, the choir will raise a profit of $650.