20% off means that now it costs 80% of original price 80% = 0.8 costs 80% of (means here times (*))original price 29.99*0.8≈23.99 10% off means that now it costs 90% of original price 90%=0.9 costs 90% of (means here times (*))original price 26*0.9=23.40 23.99>23.40, so is <span> 10% off the original price of $26 is cheaper</span>
