The assertion was "$10/m they'll need 5x customers to reach same revenue"
Revenue = Price * Quantity Sold (i.e. customers in this context).
Let x = Quantity Sold, and y = revenue
$50 * x = y
$10 = $50/5
$50/5 * x = y/5
$10 * 5x = y
OP stated a fact, and you said it was incorrect. I'm just trying to say the disagreement is actually about how elastic the price is (i.e. a change of x% in price results in a y% change in the number of customers).
The assertion was "$10/m they'll need 5x customers to reach same revenue"
Revenue = Price * Quantity Sold (i.e. customers in this context).
Let x = Quantity Sold, and y = revenue
$50 * x = y
$10 = $50/5
$50/5 * x = y/5
$10 * 5x = y
OP stated a fact, and you said it was incorrect. I'm just trying to say the disagreement is actually about how elastic the price is (i.e. a change of x% in price results in a y% change in the number of customers).