anchor.diff:            <% tax_array.each do |tax| %>
                 <% tax_t = tax_t + tax %>
             <% end %>
  -          <h4 class="t-right">Estimated Tax</h4><h4 class="s-left">$<%= tax_t %></h4>
  +          <h4 class="t-right">Estimated Tax</h4><h4 class="s-left">$<%= format("$%.2f", tax_t) %></h4>
           </div>
   
           <div style="overflow: hidden; margin: 40px 5px 5px;">
             <h4 class="t-right">Estimated total</h4>
  -          <h3 style="font-weight: lighter;" class="s-left">$<%= tax_t + cost_t %></h3>
  +          <h3 style="font-weight: lighter;" class="s-left">$<%= format("$%.2f", tax_t + cost_t) %></h3>
           </div>
   
           <hr>
   
           <input type="checkbox"> I agree to the terms and conditions.
   
  -        <button class="btn btn-sp" type="submit">Pay $<%= tax_t + cost_t %></button>
  +        <button class="btn btn-sp" type="submit">Pay $<%= format("$%.2f", tax_t + cost_t) %></button>
           <div class="outcome">
             <div id="error_hand"></div>
           </div>
  
positive.code:                 <div style="float: left; width: 50%; text-align: center">
                    <h3>Qty: 1</h3> <!-- Attach to backend -->
                    <% pr_price = product_price(product.id) %>
                    <h4><%= pr_price[5] %></h4>
                    <% tax_array.push(pr_price[1]) %>
                    <% cost_array.push(pr_price[5]) %>
                  </div>
  
negative.code:           <% cost_array.each do |cost| %>
                <% cost_t = cost_t + cost %>
            <% end %>
            <h4 class="t-right">Subtotal</h4><h4 class="s-left">$<%= format('$%.2f', cost_t) %></h4>
          </div>
  
          <div style="overflow: hidden; margin: 5px">
  