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Solution
1.To calculate the contribution margin ratio, divide the contribution margin by sales. The contribution margin is calculated by subtracting all variable costs from sales. The formula is:
(Sales - Variable expenses) / Sales *100
= ($40 - $20) / $40 *100 = $20/$40 *100
= 50%
2. Breakeven Point( in $ Sales) = Fixed costs / CM ratio
= $200000 / 50%
= $400000
Explanation : At $40000, there will be no profit and No loss situation.
3. If sales increases by $41000 and there is a contribution margin of 50%, our Contribution in $ will increase by $20500 (i.e. 41000 - Variable Costs 20500) and since there is no increase in fixed costs. SO OUR NET MARGIN WILL ALSO BE INCREASED BY $20500.
4-A. The degree of operating leverage is calculated by subtracting variable costs from sales and dividing it by sales minus variable costs and fixed costs i.e.Contribution dividing by net operating income( in this case)[It takes assumption that Fixed costs remain same]
= 480000 / 280000
=1.71 times
4-B. If sales are expected to increase by 12% and the last year operating leverage is used as 1.71 times, therefore Net operating income will increase by 20.52%(12*1.71)  
5.A No. of units sold last year = $960000/$40 = 24000 units
New Selling price = 40 *87%(after 13 % reduction) = $34.80 per unit
New sales unit = 24000 * 125%( after 25 % increase) = 30000 units
Total sales value will be = 30000 * $34.80 =$1044000
Less: Variable costs: 30000* 20 = $600000
Contribution margin $ 444000
Less: Fixed costs( 200000+ 65000 advt) $265000
Net operating Income $179000
5B. I will not recommend the proposal by Sales manager as it will be going to reduce our Net operating margin. The reeason is Incremental sales revenue is less than incremental expenses of adertising.
6. New Sales = 960000 * 125% = $1200000
No. Of units = $1200000/$40 = 30000 units
Now,
Desired Net operating income = Sales - Variable costs - sales commission - advertising costs - fixed costs
$280000 = { $1200000 -( 30000 * $20)} -($1.70 * 30000) - Advertising costs - $200000
$280000 = $1200000 - $600000 - $51000 - Advt Costs - $200000
Solving this we get,
New Advertising costs = $69000
Note: In case of any query, please feell free to ask and if satisfied please give a thumps up and comment.


