The number of basic headphones the store can purchase if it spends a total of $10,000 on headphones and buys 110 HD headphones for $70 each.

The store buys 110 HD head phone for $70 each. That means they spent 110 x 70 = $7,700 on them

$10,000 - $7,700 = $2,300

The store has $2,300 dollars left to spend on basic headphones.

The answer is $2,300 : cost of basic headphones