Answer :
1210 * 1.1 = 1331
It's like
1210 * 110% so it means 1210 + 10% of 1210, which is 121. 1210 + 121 = 1331
It's like
1210 * 110% so it means 1210 + 10% of 1210, which is 121. 1210 + 121 = 1331