Assuming he actually wins the WTA states. But the last polls in Ohio show Trump and Kasich very close, and I think with the organization Kasich has in his home state, it is highly likely he will win there. And for every WTA state Trump loses, the percentage goes up...
Look, the numbers I gave are where he is right now. Of course the numbers will change with each primary. Whether they go up or go down depends upon whether or not Trump exceeds whatever the target percentage is at that time.