Marginal Revenue is the revenue realised by selling additional units of a product.
Mathematically, Marginal Revenue can be expressed as,
![MR =(Change\:in\: Total\:Revenue)/(Change\:in\:Quantity)](https://img.qammunity.org/2019/formulas/business/middle-school/57bfm3nzcp65lvqqomjmlnok30nayhmhf2.png)
Let old Quantity be
and new Quantity be
![Q_2](https://img.qammunity.org/2019/formulas/mathematics/high-school/v35b7fiua69j90wxxpvlekyc4dqbc5twl3.png)
Since 500 units were produced first,
![Q_1=500](https://img.qammunity.org/2019/formulas/business/middle-school/1sqnwbhksk35c9ibk6jhl44ex634kg8x2e.png)
And now 100 additional units will be produced, So
![Q_2=500+100=600](https://img.qammunity.org/2019/formulas/business/middle-school/kvp3ix84i5997ccr25zv0al5pmthnj2klv.png)
Now Change in Quantity produced is
![Q_2-Q1=600-500=100](https://img.qammunity.org/2019/formulas/business/middle-school/jxolcod2fx4specn0kvti3on4c7kgbnmba.png)
Now we need to calculate for the Change in Total Revenue
We also let the initial total revenue be
.
Initially 500 units were sold for $4 per unit. This implies that,
.
=$2,000
We were given the current total revenue to be $3,000.
This implies that, our change in total revenue
.
Hence our Marginal Revenue
![MR =\frac{1,000} {100}](https://img.qammunity.org/2019/formulas/business/middle-school/inc5y4lhp67b8ij3ez9c56ccgu327brvp9.png)
![MR =10](https://img.qammunity.org/2019/formulas/business/middle-school/kujtom395os0r3nwswc6ur2ilthph4cnvd.png)
Hence the Marginal Revenue is $10.