$6.$ Connor has an income of $$280,000$ while his wife Sara made $$250,000$ in $2017.$ Each of them has made contributions to the Ovarian Cancer Institute $($Assume the taxable income threshold for charitable donations is $$202,800).$ The contributions were as follow:

Connor $=$ $$40,000$

Sara $=$ $$50,000$

If the couple chose to combine their donations onto one tax return, calculate their tax credit.