Set this out as an equation:-
13500 - 500P = 3000 + 200P.
Add 500P to both sides:-
13500 = 3000 + 700P
Subtract 3000 from both sides:-
10500 = 700P
Divide both sides by 700:-
P = 10500/700 = 105/7 = 15.
Therefore the equilibrium price is 15.
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Because demand creates the price, and not the price dictates the demand.
The equilibrium price is the unit cost, which is the same as the total cost divided by the number of units produced (output).
Change in the demand for a goods and the change in its price. The ratio is negative but the negative sign is usually dropped.
Here are two variablesDemand and Price, whereas Price is Independent variable &Demand is dependent variable, i.e. if price of something changes the demand will also be affected. Now simple Differential Equation isd (Demand)= constantd (Price)But keep in mind that Price is a function not a simple variable.
Cost price divided by selling price then multiply by 100 Eg. Cost price £5 divided by selling price £20 equals £0.25, multiplied by 100 equals 25%