Answer: MRP or the Marginal Revenue Product is the addition to total revenue when one more unit of a product is produced and sold in the market. It can be calculated using the given formula,
![MRPn = TRn - TRn-1](https://img.qammunity.org/2019/formulas/business/college/ott62wzuhja4lrslrex282ft1lpks8thgf.png)
Therefore, MRP for the twelfth worker will be,
![MRP_(12) = TR_(12) - TR_(11)](https://img.qammunity.org/2019/formulas/business/college/cotqv6057ccaylurvwcg0ks6vlcs2opzs4.png)
which is total revenue at 12th worker minus total revenue for the 11th worker.