Smart Calculator
It is a general purpose calculator to compute percent tax, profit, loss and discount.
It is also good for student to cross check answer for a common equation to compute area, volume and other units and equations by hand.

Sales Calculator
Tax Calculator
Percent Calculator
Profit Calculator
Discount Calculator

Memory:
M+ add to memory
M- subtract from memory
MC clear memory
MR recall from memory

Operator Precedence:
Highest: ( ) (parenthesis)
Higher : ^ (power)
High: * (multiply), / (division), mod (remainder)
Low: + (plus), - (minus)

Equation and Result display
Equation: 3x(4+5)-6^2+9/3
Tap: =
Result: -6
Equation become: 3x(4+5)-6^2+9/3 = -6

Tap: 2 x Pi x 10
Equation: 2x3.14x10
Tap: = 
Result: 62.80
Equation: 2x3.14x10 = 62.80

AC: Clear equation and result to 0
Pi: 3.14

Percent Calculation
Enter % for calculation, e.g 7%
Enter number, e.g. 500
Equation: 500
Tap M+ to store number (500) in memory.
Tap % button (compute 7% of 500)
Result: 35 (500*7%)

Tap AC to reset equation and result to 0.
Tap MR button (memory recall)
Equation: 500
Tap +% button (compute 500 + 7% of 500)
Result: 535 (500+500*7%)

Tap AC to reset equation and result to 0.
Tap MR button (memory recall)
Equation: 500
Tap -% button (compute 500 - 7% of 500)
Result: 465 (500-500*7%)

Tap AC to reset equation and result to 0.
Tap MR button (memory recall)
Equation: 500
Tap -vat button (computer value without tax, remove tax from 500)
Result: 467.29 (500*100/(7+100))
in other word: 467.29+467.29*7% = 500

Power of number: compute x^y
equation: 2^16
result: 65536

Discount: total price 1250 and discount 15%, find discount price.
enter percent: 15
equation: 1250
tap: -%
result: 1062.5

Profit: capital 2000, profit 25%, find total return amount.
enter percent: 25
equation: 2000
tap: +%
result: 2500

Value without tax: total price 1250 include 7% tax find price without tax.
enter percent: 7
equation: 1250
tap: -vat
result: 1168.22

Mod: find the remainder of division
equation: 50mod9
result: 5