What you want to do is take the 20 and 1/2 pounds and divide it by 6 which gives you 3.41 make it a fraction and simplify which gives you an answer of 3 2/10
multiply 18 and 13, which is equal to 234. then multiply that by $5.86 which is equal to $1371.24 then the last step add that by $800. which is equal to $2171.24. hope this helps