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 23,700 13,200 9,700 46,600 Allocated joint costs ? ? ? $ 349,000 Sales value at split-off $ 378,000 $ 252,000 $ 98,000 $ 728,000 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?