Riley's yogurt weighs 8.641 ounces, which falls into the 5.001 to 10.0 ounces category, costing $3.89. Sasha's yogurt weighs 5.77 ounces, also falling into the 5.001 to 10.0 ounces category, costing $3.89. If they pay separately, the total cost is $3.89 + $3.89 = $7.78.
If they pay together, the combined weight is 8.641 + 5.77 = 14.411 ounces, which falls into the 10.001 to 15.0 ounces category, costing $5.29.
Therefore, Riley and Sasha should pay for their yogurt together to pay a lower price of $5.29 instead of $7.78.
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