Help with simple function please.

On my worksheet I have three columns
Column B4 =276 Minutes
Column C4 = 14 seconds
In column D4, I need to calculate the minutes into seconds in B4, add the seconds in C4, convert the total seconds of both B4 and C4 back into minutes x £0.20
So far I got as far as =SUM(B4*60)+C4, which gives me 16574
I need to convert 16574 back into minutes then * the figure by £0.20

Thanks

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