Frank is a talented gardener who maintains a wonderful garden of flowers and vegetables at his house. He is deciding whether or not he should start his own landscaping business, or continue gardening at home. Frank earns $396 per week selling flowers and vegetables from his garden whereas working as a landscaper would enable him to earn $840 per week. Frank incurs mulch and fertiliser costs of $85 per week while gardening at home.
What is Frank's weekly accounting profit from gardening at home? Answer to the nearest whole number (with no decimal places, $ or - signs, spaces or commas).