Please show step by step solution for the calculation.

Exco Ltd is a Canadian controlled private corporation with interest income of $ $100,000$ and $100\%$ of its active business income of $ $750,000$ earned in Ontario for both $2021$ and $2020.$ Exco Ltd$.$ has no associated corporations.

Required: $($show all calculations$)$

$1.$Calculate Exco Ltd$.$s federal income tax payable for $2021$ under Part I of the Income Tax Act.