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Answer:
May
Step-by-step explanation:
Let x be the sales in January,
∵ Sales were 10% greater in February than in January,
So, the sales in February = (100 +10)% of x
= 110% of x
=
= 1.1x
∵ it is 15% less in March than in Feb,
Sales in march = (100-15)% sales in February
= 85% of 1.1x
= 0.935x
∵ It is 20% greater in April than in March,
Sales in April = (100+20)% of sales in march
= 120% of 0.935x
= 1.122x,
∵ It is 10% less in May than in April
Sales in May = (100-10)% of sales in march
= 90% of 1.122x,
= 1.0098x,
∵ It is 5% greater in June than in May
Sales in June = (100+5)% of sales in march
= 105% of 1.0098x,
= 1.5147x
∵ 1.0098x is much closure to x than 1.1x, 0.935x, 1.122x and 1.5147x
Hence, the sales in May is closest to sales in January.