If the final price is $4 then total labour cost is 60 cents if a 15% labour cost is assumed.  A 32% increase on 60 cents is about 20 cents.  It was a quick example, not a business plan.

Are you saying that we will all starve because farmers will go out of business, or that every other labour dependent industry will go under because of a minimum wage increase?  Hasn't happened in other jurisdictions that have done it.  In France, the minimum wage is 9.61 euro (about $15), yet they are the world's 6th largest agricultural producer.