i want to add if topic includes "fi" then com = premium * 0.23 in to this code  ..
			let com;
				if (premium < 1900) {
				com = premium * 0.12;
				} else {
				com = premium * 0.18;
			}

Certainly! If you want to add an additional condition for when the topic includes “fi,” you can modify the com calculation accordingly. Here’s the updated code:

function calculatePremium() {
  // ... (your existing code) ...

  // Calculate commission (com)
  if (topic.includes("fi")) {
    com = premium * 0.23; // If topic includes "fi," set commission to 23%
  } else if (premium < 1900) {
    com = premium * 0.12;
  } else {
    com = premium * 0.18;
  }

  // ... (rest of your existing code) ...
}

This modification checks whether the topic includes “fi.” If it does, the commission (com) is set to premium * 0.23. If not, it proceeds with the existing conditions for calculating the commission based on the premium amount.

Make sure to replace the existing commission calculation in your code with this updated block.