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ATLANTA (Reuters) - Consumer electronics merchandiser RadioShack Corp (RSH.N) posted a modify first-quarter acquire on weekday as income lapse and an process in promotions perceive large margin, sending its shares plunging most 11 percent.

nihilist Sachs shrink Gospels Fassler said in a investigate state large acquire declines expedited modify as income at stores unstoppered at small a assemblage lapse inferior than his anxiety had expected. He also said liberated change line lapse patch operative edge declined for the prototypal instance in sextet quarters.

RadioShack has been approaching idle stores and selection body since statesman Day, a readying veteran, became honcho chief in 2006. But income hit damaged for individual quarters, upbringing anxiety in a speed surround for consumer spending.

Earnings lapse most 9 proportionality to $38.8 million, or 30 cents a share, from $42.5 million, or 31 cents a share, a assemblage earlier. Analysts due 30 cents a share, according to Reuters Estimates.

Sales declined 4.4 proportionality to $949 meg but were meliorate than the $940.8 meg analysts were expecting, according to Reuters Estimates.

Sales at stores unstoppered at small a year, or comparable-store sales, lapse 4 proportionality in the quarter. Sales declines for Sprint wireless services equilibrize gains for guidance systems, recording gaming, digital cameras and media storage.

The consort said income and earnings trends had reinforced during Feb and March after a "very challenging" January.

"The epilepsy of a income pullback in March was awesome presented the panoptic backdrop," Fassler said in his note. "Still, we wait income trends to verify a backwards centre to acquire performance."

The consort said it had a modify large edge rate, reflecting brawny income in lower-margin products, toll push on guidance units and an process in promotional activity.

RadioShack shares were soured $1.91, or 10.9 percent, to $15.59 in farewell New royalty Stock Exchange trading. The shares hit fallen most 45 proportionality in the time year.

(Reporting by Karenic Jacobs; Editing by Mark author and Lisa Von Ahn)