Lola has 4 puppies. Every hour the number of puppies she has triples. How many puppies does she have by the third hour. What is the formula?
$${\mathtt{4}}{\mathtt{\,\times\,}}{{\mathtt{3}}}^{{\mathtt{3}}} = {\mathtt{108}}$$
4x3= 12x3= 36x3=108 puppies