During the current year, Mute Corporation expected to sell 22,400 telephone switches. Fixed costs for the year were expected to be $12,142,000, the unit sales price was budgeted at $3,200, and unit variable costs were budgeted at $1,360. Mute's margin of safety ratio (MOS %) is: (Do not round intermediate calculations.) 75.44%. 86.29%. 91.79%. 70.54%. 69.54%.