Given,
Marked price (MP) on cycle = Rs 840
Discount = 10%
Discount = (MP × Discount %)/100
= (840×10)/100
= Rs 84
SP = MP – Discount
= 840 – 84
= Rs 756
Given, he makes a profit of 26% additionally
So, by using the formula,
CP = 100 / (100 + Gain %) × SP
= 100 / (100 + 26) × 756
= 100/126 × 756
= 600
∴ Actual cost of the cycle is Rs 600.