In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu `alaykum wa-rahmatullāhi wa-barakātuh.
In principle a person is rewarded according to his level of sincerity (ikhlass) and devotion in performance of a deed. That reward is best known by Allah Suhana WaTa’ala. However, if a person knows the reward of doing certain deed, that knowledge would further motivates him in doing the deed with more sincerity and thereby increase his reward. [i]
And Allah knows best.
Mufti Saeed Ahmed Golaub
Islamic Solutions
Jamaica
[i] 796- حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، عَنْ بَكْرٍ يَعْنِي ابْنَ مُضَرَ، عَنِ ابْنِ عَجْلَانَ، عَنْ سَعِيدٍ الْمَقْبُرِيِّ، عَنْ عُمَرَ بْنِ الْحَكَمِ، عَنْ عَبْدِ اللَّهِ بْنِ عَنَمَةَ الْمُزَنِيِّ، عَنْ عَمَّارِ بْنِ يَاسِرٍ، قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: «إِنَّ الرَّجُلَ لَيَنْصَرِفُ وَمَا كُتِبَ لَهُ إِلَّا عُشْرُ صَلَاتِهِ تُسْعُهَا ثُمْنُهَا سُبْعُهَا سُدْسُهَا خُمْسُهَا رُبْعُهَا ثُلُثُهَا نِصْفُهَا»(سنن ابى داود –ج1- ص 211)