This is for sales of Weapon of Choice for October 2009 which includes dropping the price from 400 MS Points to 240 MS Points.
Total sales: 870
165 at 400 MS Points
705 at 240 MS Points
In the graph, you can clearly see the jump in sales once we dropped the price. Some Indie Games' sales haven't improved with dropping the price. Weapon of Choice's sales have probably increased because it's fortunately had a lot of press and critical praise, so it worked out pretty well.
Broken down by 240 vs 400 we have:
Trial downloads October 1st to the 12th (400 point period): 4,221
With 165 sales, the conversion rate is 3.9%
Trial downloads October 13th to the 31st (240 point period): 8,897
With 705 sales, the conversion rate is 7.9%
Average trial downloads per day for 400 point period: 351
Average trial downloads per day for 240 point period: 494
Trial downloads increases approximately 1.4 times daily after the price was lowered.
Additionally it's reasonable to conclude we had a revenue increase for this month as well.
We can approximate how many much money we would have grossed if we simply had kept the 400 points as follows:
351 average downloads a day * 31 days in the month = 10881 downloads
10881 downloads * 0.039 = 424 sales
We'll use the American prices to make our math simpler.
424 * $5 = $2,120
And here's what we actually grossed for the month:
165 (400 Point sales) * $5 = 825
705 (240 Point sales) * $3 = 2115
825+2115 = $2,940
We can then divide 2,940 by 2,120 and see that our revenue increased by about 1.38 times.