Exchange rate calculation

Hi, I’d appreciate any help on this! I bought $2500USD @ an exchange rate of 1.61 = $4025CDN I then turned around and sold $200USD @ 1.03 = $206CDN What is my effective exchange rate on the total transaction for $2300USD remaining? Is it ($4025CDN - 206CDN)/($2500USD-$200USD) = 1.66 ?