well, due to that 10% of the muffins get wasted and do not sell,
plus work that goes into it, the price of the ice-cream is not 0.60,
but 55% more, or markup above that cost value
so... how much would each muffin sell for? well, each muffin will be,
0.60 + 55% of 0.60
how much is 55% of 0.60?

get the 55%, and add it to the 0.60, that's how much each will sell for