can someone help me out with an array formula again?

range e4:e56 will contain a number most of the time
this number can be appended with an x. over in column g there will be an
amount. the x will always be the last character
1234 1000
5678x 500
135 200

i need a formula to sum column g4:g56 based on each condition, each in a
separate cell.
one result = 1200. the other = 500

can somebody help?


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Gary