Shell investors aren't happy this morning.

While the FTSE 100 is booming on signs of a Conservative victory, the oil giant opened lower 1.5% after shareholders caught sight of disappointing results from BG Group.

Shell is buying oil explorer BG Group for 47 billion ($70 billion), but BG today revealed that its earnings have fallen off a cliff due to the oil price slump, dropping 41% in the first quarter.

Investors will be worrying that Shell has overpaid.

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