The normal price of each chair is
The percentage off the normal price is
The percentage of the present price of each chair will be
To calculate the present value of one chair, we will use the formula below
By substituting the values, we will have
Since Mr .Krabs bought 4 chairs, the amount he spent will be
By substituting the values, we will have
Therefore,
The amount Mr.Krabs spent is = $6.30