The following production and total cost information relates to a single product organisation for the last three months: Month Production Total cost units £ 1 1,200 66,600 2 1,900 58,200 3 1,400 68,200 The variable cost per unit is constant up to a production level of 2,000 units per month but a step up of £6,000 in the monthly total fixed cost occurs when production reaches 1,100 units per month.what is the total cost for a month when 1000 units are produced