William wants to buy a bag but he can only afford 55% of the cost of the bag.<br>After his father gives him $7, he is still short of $$\frac{1}{10}$$ of the money. <hr> How much money is he still short of? <br> <input min="0" type="number" id ="imp6pg113q9a_1" class="lineinput" placeholder="?" />