butterfly corp. manufactures products m1 and m2 from a joint process, which also yields a by-product, b1. butterfly accounts for the revenues from its by-product sales as other income. additional information follows: m1 m2 b1 total units produced 22,500 13,500 9,000 45,000 allocated joint costs ? ? ? $ 400,000 sales value at split-off $ 420,000 $ 280,000 $ 100,000 $ 800,000 required: assuming that joint product costs are allocated using the net realizable value at split-off approach, what was the joint cost allocated to product m1? (do not round intermediate calculations.)