William wants to buy a bag but he can only afford 55% of the cost of the bag.<br>His father&nbsp; then gave him $7 but&nbsp; he is still short of $$\frac{1}{10}$$ of the money.<div>The cost of the bag is $<input min="0" type="number" id="imp6pg113q9b_1" class="lineinput" placeholder="?">.</div>