Question 288207
d = DVD player, with $75 profit
For every DVD player sold, the shop would earn 75d
c = cordless phone, with $30 profit
For every DVD player sold, the shop would earn 30c

The total profit of the score would be the profit from d and c summed up, which is: 30c + 75d

<i>"The store wants to make a profit of at least $255.00 from its sales of DVD players and cordless phones."</i>
This is merely a fancy way of saying that the total profit should be <b>equal to or bigger</b> than $255

The inequality would then be: {{{30c + 75 d >= 225}}}

If wanted, it can be simplified with a simple division by 15: {{{2c + 5d>=15}}}