How do you effectively destroy Blastpopoulous?

How do you effectively destroy Blastpopoulous? - Cracked surface on black background

I have been playing Bloons Monkey City (B.M.C.) and there is this boss called Blastpopulous and he just kept throwing fireballs and stunning my dartling gun. It took me 3 tries just to beat him lv.1, and I gained nothing other than a couple of bloonstones. Is there a strategy that can destroy him in 1 or 2 tries?

bloons-monkey-city

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How do you effectively destroy Blastpopoulous? - Pink color neon luminous text with inspiring phrase You are flowers on the road on black signage at night

BMC Mobile - BLASTAPOPOULOS BOSS - Levels 1 to 20 completed - EASY

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Images: Kritsada Seekham, Karen Laårk Boshoff, Photography Maghradze PH, Ryutaro Tsukata