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182 12: The Equation Solver
File name : 17BII-Plus-Manual-E-PRINT-030709 Print data : 2003/7/11
Profit ＝ (Price × Quantity) － (Variable costs × Quantity)
－ Fixed Costs
The C-Sharp Piano Corporation sells pianos for $6,000. Variable costs
are $4,100; fixed costs per year are $112,000. How many pianos
must C-Sharp sell this year in order to earn a profit of $130,000? (In
past years, C-Sharp has had to sell between 100 and 200 pianos to
make an acceptable profit. You can use this information as initial
guesses.)
Press
&
/
, then enter the equation:
52EG;:852;7H
]
Y:@/O127EF:
]
Y:@/G;X7EF:"
Keys: Display: Description:
I
E
" Stores, verifies, and
creates labels for the
equation.
6000
*
52;7H8'K(((&((" Stores price.
4100
"
O127E"
112000
"
G;X7E"
130000
"
52EG;"
O127EF:8+K#((&(("
G;X7EF:8##$K(((&(("
52EG;:8#%(K(((&(("
Stores variable cost,
fixed cost, and profit.
The following steps enter guesses for QTY. If the Solver must search
iteratively to solve for QTY, it will begin by using the estimates 100 and
200.
Keys: Display: Description:
100
"
Y:@"
Y:@8#((&((" The first guess for QTY.
200
"
Y:@"
Y:@8$((&((" The second guess for
QTY.