The cost of one preferred stock is calculated by dividing the dividend by the price. In mathematical equation this is expressed as,
C = (D / P) x 100%
where C is the cost, D is the dividend, and P is the price. Substituting the known values,
C = (($3.5)/ ($70) x 100%
C = 5%
The answer to this item is the first choice, 5%.