Consider that the break-even quantity is the one corresponding to which the profit is zero i.e. the production cost becomes equal to the revenue earned.
Equate the functions and solve for the break-even quantity as follows,
![\begin{gathered} C(x)=R(x) \\ 560x+17,080=700x \\ 700x-560x=17,080 \\ 140x=17,080 \\ x=122 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/65r0wyj6fkesw2bfk0ftxm5dvk65myzud7.png)
Thus, the break-even quantity is 122 units.