An electronics store is offering two different discounts on its headphones: a volume discount for large orders and a promo code discount. For orders with $n$ headphones, where $10 < n < 50$, a volume discount of $n\%$ off the original price of $60 is applied to the price of each headphone. If a promo code is applied to the order, a discount of an additional $3 is applied to the price of each headphone, after the volume discount is applied. For a certain order with both the volume discount and the promo code applied, the total price after the discounts for the headphones purchased was $1,050. How many headphones were purchased in this order?