MES calculation question

[earlgrey]

Can someone help me understand how Rothbard gets the bolded figure?

Suppose, for example, that the price of the fourth-order capital good on the external market is 103 ounces. The Jones Company then estimates its implicit price for this intermediate product at what it would have brought on the market if it had been sold there. This price will be about 103 ounces.[56] Assuming that the price is estimated at 103, then the total amount of money spent by Jones’ lower-order plant on factors is 15 (explicit, on original factors) plus 103 (implicit, on capital goods) for a total of 118.

Now the Jones Company can calculate the profits or losses made at each stage of its operations. The “higher” stage bought factors for 100 ounces and “sold” them at 103 ounces. It made a 3-percent return on its investment. The lower stage bought its factors for 118 ounces and sold the product for 140 ounces, making a 29-percent return. It is obvious that, instead of enjoying a general profit­ability, the Jones Company suffered a 2-percent entrepreneurial loss on its earlier stage and gained a 24- percent profit on its later stage. Knowing this, it will shift resources from the higher to the lower stage in accordance with their respective profitabilities—and there­fore in accordance with the desires of consumers. Perhaps it will abandon its higher stage altogether, buying the capital good from an external firm and concentrating its resources in the more profit­able lower stage.

[leonidia]

It’s obviously an error. It should be a 19% return with a 14% entrepreneurial gain. (instead of 29% and 24%)