Each​ year, Johan typically does all his own landscaping and yard work. He spends ​$210 per year on mulch for his flower​ beds, ​$216 per year on flowers and​ plants, ​$46 on fertilizer for his​ lawn, and ​$246 on gasoline and lawn mower maintenance. The lawn and garden store where he obtains his mulch and fertilizer charges other customers ​$513 for the service of spreading that much mulch in flower beds and ​$46 for the service of distributing fertilizer over a yard the size of​ Johan's. Paying a professional yard care service to mow his lawn would require an expenditure of ​$1 comma 156 per​ year, but in that case Johan would not have to buy gasoline or maintain his own lawn mower. a. In a normal​ year, calculate by how much does​ Johan's landscaping and yard work contribute to GDP. ​$ nothing.