Store S:
Original price = $840
Discount = 25% off
Sale price = Original price - (Discount percentage * Original price)
Sale price = $840 - (0.25 * $840) = $840 - $210 = $630
Store T:
Original price = $780
Rebate = $150
Sale price = Original price - Rebate
Sale price = $780 - $150 = $630
Therefore, the true statement about the sale prices of the bike is that both Store S and Store T offer the bike at a sale price of $630 after applying the respective discounts and rebates.