If a shopkeeper is selling W gram of salt in 1 dollar he will face r% loss. How much salt he should sell in grams to make r% profit. Assume weighing and packaging price is zero.
Remove any row in which a NaN appears
Test for balanced parentheses
Generate N equally spaced intervals between -L and L
Percentage profit:5: Cumulative Interest
Percentage profit:6: Cumulative Interest
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