Deduction u/s 80g

Deduction u/s 80G is not according to the amount... but by the %age.. i.e. 50% of the amount donated would be allowed as deduction.

for 80G maximum limit is 10% of qualifiying amount

for donation to education insititute (if it is eligible for 80G) 50% of amount is eligible

The extent of deduction is either 50% or 100% of the contribution, depending on the charitable institution donated to.

For certain funds, the aggregate deduction is limited to 10% of the “Adjusted Gross Total Income”. So, in such cases, even if you do make a donation larger than 10% of your Adjusted Gross Total Income, the donation amount eligible for claiming a deduction would be capped at 10% of the Adjusted Gross Total Income.

The Adjusted Gross Total in this case, is the gross total income minus long-term capital gain, short term capital gain and all deductions u/s 80CCC to 80U except any deduction under this section.