It epends on a number of variables.
Type of cards (rarity)
Condition of cards
The editions that the cards are from (some sets are more sought after than others)
you can sell 100 count box of cards for as little as $40, but some cards have a generic value of hundreds of dollars. you need to do a bit more research first.
Depends how much you think they are worth
60-75 cards,
A standard Magic: The Gathering deck should have 60 cards for optimal gameplay.
Magic: The Gathering, is a game that uses cards during gameplay. The mugging card causes 2 damage to the opponent. The opponent cannot block this turn.
I bought my first pack for $2 but now they are around $4. I don't think the price will go up that much.
AROUND $2
The amount of pay being a professional Magic the Gathering player varies, but if your good enough, I would say around $100,000.
In Magic: The Gathering, the keyword "lifelink" means that whenever a creature with lifelink deals damage, its controller gains that much life.
check your local card store
Around 1.40 $ US.
Average price is $1.50
That depends on if the starter deck is sealed or not. If it is open, the cards and their condition.