-cat << EOF > "$WORKSPACE/archives/cost.csv"
-$JOB_NAME,$BUILD_NUMBER,$date,$resource,$uptime,$cost,$stack_cost
-EOF
-
+# Format the uptime, cost & stack_cost fields
+printf "%s,%s,%s,%s,%d,%.2f,%.2f\n" "$JOB_NAME" "$BUILD_NUMBER" "$date" \
+ "$resource" "$uptime" "$cost" "$stack_cost" > "$WORKSPACE/archives/cost.csv"