How do you beat the 50 MOAB special mission in Bloons Tower Defense 5

Make four dart monkeys in the beginning intersection and upgrade them to super monkey fan clubs. Then make three dart monkeys on the other side of the intersection and just upgrade them to three darts at a time (not SMFC). Make more 3-darts-at-a-time dart monkeys nearby until you run out of cash, then you're ready to start. As soon as the moabs start coming, use the SMFC upgrade. If the moabs are getting through your dart monkeys easily, you did something wrong. Then keep using the SMFC when the last one runs out, and you'll win easily.