Follow BODMAS rule to solve this question, as per the order given below,

Step-1: Parts of an equation ENCLOSED in 'Brackets' must be SOLVED FIRST, and in the bracket,

Step-2: Any mathematical 'Of' or 'Exponent' must be solved next,

Step-3: Next, the parts of the equation that contain 'Division' and 'Multiplication' are calculated,

Step-4: LAST but not least, the parts of the equation that contain 'Addition' and 'Subtraction' should be calculated.

$(\begin{array}{l} \Rightarrow \left( {\frac{{18.49 - 9.81}}{{1849 - 981}}} \right) \DIV \left( {\frac{{184.9 - 98.1}}{{0.1849 - 0.0981}}} \right) = \;?\\ \Rightarrow \left( {\frac{{8.68}}{{868}}} \right) \div \left( {\frac{{86.8}}{{0.0868}}} \right) = ?\\ \Rightarrow \left( {\frac{{868 \times 0.01}}{{868}}} \right) \div \left( {\frac{{\left( {868 \times 0.1} \right)}}{{\left( {868 \times 0.0001} \right)}}} \right) = ?\\ \Rightarrow \left( {0.01} \right) \times \frac{{0.0001}}{{0.1}} = ? \end{array})$

⇒ ? = 10^-2 × 10^-4 × 10

⇒ ? = 10^-5